An iPhone screen shows an information on NHS COVID-19 vaccination booking website, in Keele, Britain, December 13, 2021. REUTERS/Carl Recine/Illustration 

The coronavirus disease (COVID-19) contact tracing smartphone app of Britain's National Health Service (NHS) is displayed on a mobile phone in this illustration photograph taken September 24, 2020. REUTERS/Jason Cairnduff/Illustration 

The coronavirus disease (COVID-19) contact tracing smartphone app of Britain's National Health Service (NHS) is displayed on a mobile phone in this illustration photograph taken September 24, 2020. REUTERS/Jason Cairnduff/Illustration 

The coronavirus disease (COVID-19) contact tracing smartphone app of Britain's National Health Service (NHS) is displayed on a mobile phone in this illustration photograph taken September 24, 2020. REUTERS/Jason Cairnduff/Illustration 

The coronavirus disease (COVID-19) contact tracing smartphone app of Britain's National Health Service (NHS) is displayed on an iPhone in this illustration photograph taken in Keele, Britain, September 24, 2020. REUTERS/Carl Recine/Illustration 

The coronavirus disease (COVID-19) contact tracing smartphone app of Britain's National Health Service (NHS) is displayed on an iPhone in this illustration photograph taken in Keele, Britain, September 24, 2020. REUTERS/Carl Recine/Illustration 

The coronavirus disease (COVID-19) contact tracing smartphone app of Britain's National Health Service (NHS) is displayed on an iPhone in this illustration photograph taken in Keele, Britain, September 24, 2020. REUTERS/Carl Recine/Illustration 

Nadine Dorries, MP looks at a phone during the opening of the NHS Nightingale Hospital as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 3, 2020. REUTERS/John Sibley 

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) talks to a voter's daughter on his mobile phone at a polling site for New Hampshire’s first-in-the-nation primary in Portsmouth, New Hampshire, U.S., February 11, 2020. REUTERS/Brian Snyder 

Reporters use their mobile phones to record Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) as she answers questions in Portsmouth, New Hampshire, U.S., February 10, 2020. REUTERS/Brian Snyder 

Democratic 2020 U.S. presidential candidate and U.S. Senator Cory Booker (D-NJ) records a video on a teacher's mobile phone in Manchester, New Hampshire, U.S., July 13, 2019. REUTERS/Brian Snyder 

Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) checks his mobile phone after marching in the Nashua Pride Parade in Nashua, New Hampshire, U.S., June 29, 2019. REUTERS/Brian Snyder 

Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) checks his mobile phone before marching in the Nashua Pride Parade in Nashua, New Hampshire, U.S., June 29, 2019. REUTERS/Brian Snyder 

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) speaks while her aide Nora Keefe checks her mobile phone backstage at a campaign stop in Exeter, New Hampshire, U.S., March 15, 2019. REUTERS/Brian Snyder 

Twenty-five-year-old John Jackson checks his mobile phone in Concord, New Hampshire, U.S., March 27, 2018. Picture taken March 27, 2018. REUTERS/Brian Snyder 

Russ Van Deursen (2nd R) takes a cell phone photo of the scene after filling out his ballot before casting it in the U.S. presidential election at midnight in tiny Dixville Notch, New Hampshire, late November 7, 2016. REUTERS/Mary Schwalm 

Members of the audience take pictures of U.S. Democratic presidential nominee Hillary Clinton as she speaks at a campaign rally in Manchester, New Hampshire, U.S., November 6, 2016. REUTERS/Lucas Jackson

A supporter with a Republican presidential nominee Donald Trump cover on her phone rallies with the candidate in Bedford, New Hampshire, U.S. September 29, 2016. REUTERS/Jonathan Ernst 

Supporters rally with Republican presidential nominee Donald Trump in Bedford, New Hampshire, U.S. September 29, 2016. REUTERS/Jonathan Ernst 

Supporters of U.S. Democratic presidential candidates Hillary Clinton and Senator Bernie Sanders try to get a photo as the candidates enter the gymnasium for a rally in Portsmouth, New Hampshire, U.S. July 12, 2016. REUTERS/Mary Schwalm 

Deputy campaign manager Michael Glassner checks his mobile phone at a campaign town hall meeting with U.S. Republican presidential candidate Donald Trump outside a closed Osram Sylvania manufacturing facility in Manchester, New Hampshire June 30, 2016. REUTERS/Brian Snyder 

Deputy campaign manager Michael Glassner checks his mobile phone at a campaign town hall meeting with U.S. Republican presidential candidate Donald Trump outside a closed Osram Sylvania manufacturing facility in Manchester, New Hampshire June 30, 2016. REUTERS/Brian Snyder 

Democratic U.S. presidential candidate Hillary Clinton greets supporters at her final 2016 New Hampshire presidential primary night rally in Hooksett, New Hampshire February 9, 2016. REUTERS/Adrees Latif 

U.S. Republican presidential candidate Donald Trump gives a thumbs up to supporters waiting outside as he does a radio interview over the phone at a polling place for the presidential primary in Manchester, New Hampshire February 9, 2016. REUTERS/Rick Wilking 

U.S. Republican presidential candidate Donald Trump does a radio interview over the phone as a U.S. Secret Service agent waits to open the door before Trump greets supporters at a polling place for the presidential primary in Manchester, New Hampshire February 9, 2016. REUTERS/Rick Wilking 

A supporter of Republican U.S. presidential candidate Donald Trump takes a photograph as she attends a Trump campaign rally at the Verizon Wireless Arena in Manchester, New Hampshire, February 8, 2016. REUTERS/Rick Wilking 

A supporter of Republican U.S. presidential candidate Donald Trump takes a photograph as she attends a Trump campaign rally at the Verizon Wireless Arena in Manchester, New Hampshire, February 8, 2016. TPX IMAGES OF THE DAY REUTERS/Rick Wilking 

A man speaks on the phone as Republican presidential candidate Marco Rubio speaks at a campaign event in Manchester, New Hampshire, February 8, 2016. REUTERS/Carlo Allegri 

A girl plays on a mobile phone as U.S. Republican presidential candidate Marco Rubio speaks at a town hall campaign rally in Derry, New Hampshire, February 5, 2016. REUTERS/Mike Segar 

Attendees use their smart phones to capture Democratic presidential candidate Hillary Clinton during a campaign stop at a YWCA in Manchester, New Hampshire, February 5, 2016. REUTERS/Adrees Latif 

An audience member uses a mobile phone to photograph U.S. Republican presidential candidate Donald Trump at a campaign rally in Portsmouth, New Hampshire February 4, 2016. REUTERS/Brian Snyder 

U.S. Democratic presidential candidate Hillary Clinton takes a selfie with supporters following a campaign rally in Manchester, New Hampshire, February 3, 2016. REUTERS/Carlo Allegri 

A supporter takes a photo of U.S. Democratic presidential candidate Hillary Clinton with a smart phone after a campaign rally at Winnacunnet High School in Hampton, New Hampshire February 2, 2016. REUTERS/Adrees Latif 

U.S. Democratic presidential candidate Hillary Clinton (R) takes a selfie with a supporter after leading a campaign rally at Winnacunnet High School in Hampton, New Hampshire February 2, 2016. REUTERS/Adrees Latif 

U.S. Democratic presidential candidate Hillary Clinton (R) shakes hands with a supporter after leading a campaign rally at Winnacunnet High School in Hampton, New Hampshire February 2, 2016. REUTERS/Adrees Latif

U.S. Senator and Republican presidential candidate Marco Rubio poses for a photo with supporters following a campaign rally in Exeter, New Hampshire, February 2, 2016. REUTERS/Carlo Allegri 

U.S. Senator and Republican presidential candidate Marco Rubio poses for a photo with supporters following a campaign rally in Exeter, New Hampshire, February 2, 2016. REUTERS/Carlo Allegri 

U.S. Republican presidential candidate and U.S. Senator Ted Cruz (L) sits in his vehicle and looks at his mobile phone before a campaign rally in Hollis, New Hampshire January 20, 2016. REUTERS/Brian Snyder 

U.S. Republican presidential candidate and U.S. Senator Ted Cruz sits in his vehicle and looks at his mobile phone before a campaign rally in Hollis, New Hampshire January 20, 2016. REUTERS/Brian Snyder 

U.S. Republican presidential candidate and U.S. Senator Ted Cruz sits in his vehicle and looks at his mobile phone before a campaign rally in Hollis, New Hampshire January 20, 2016. REUTERS/Brian Snyder 

U.S. Republican presidential candidate and U.S. Senator Ted Cruz poses for a photograph with an audience member at a campaign town hall meeting in Exeter, New Hampshire January 20, 2016. REUTERS/Brian Snyder 

U.S. Republican presidential candidate Donald Trump kisses the cheek of a young audience member onstage after honoring her request for a selfie at a campaign rally in Portsmouth, New Hampshire January 16, 2016. The rally was part of former U.S. Senator Scott Brown's "No BS Backyard BBQ" series with all of the presidential candidates. REUTERS/Brian Snyder 

U.S. Republican presidential candidate and U.S. Senator Marco Rubio poses for a selfie with an audience member at a campaign town hall meeting at Nashua Community College in Nashua, New Hampshire January 7, 2016. REUTERS/Brian Snyder 

Huma Abedin, aide to U.S. Democratic presidential candidate Hillary Clinton, checks her mobile phone during a campaign town hall meeting in Derry, New Hampshire January 3, 2016. REUTERS/Brian Snyder 

A potential supporter uses a smart phone to take a photo of U.S. Republican presidential candidate and Ohio Governor John Kasich during a campaign town hall meeting in Nashua, New Hampshire, December 29, 2015. REUTERS/Mary Schwalm 

An audience member uses her mobile phone to photograph U.S. Democratic presidential candidate Hillary Clinton at a campaign town hall meeting at South Church in Portsmouth, New Hampshire December 29, 2015. REUTERS/Brian Snyder 

Audience members use their mobile phones to record and photograph U.S. Republican presidential candidate Donald Trump speaking at a campaign rally in Nashua, New Hampshire December 28, 2015. REUTERS/Brian Snyder 

A campaign staffer walks past truck bays before U.S. Republican presidential candidate and New Jersey Governor Chris Christie's event to kick off a campaign bus tour in Exeter, New Hampshire December 19, 2015. REUTERS/Gretchen Ertl 

U.S. Democratic presidential candidate Hillary Clinton poses for a selfie with audience members at a campaign town hall meeting in Salem, New Hampshire December 8, 2015. REUTERS/Brian Snyder 

A supporter of U.S. Democratic presidential candidate Hillary Clinton looks at her mobile phone under portraits of past New Hampshire Governors while waiting for Clinton to file her declaration of candidacy to appear on the New Hampshire primary election ballot at the state house in Concord, New Hampshire November 9, 2015. REUTERS/Brian Snyder 

U.S. Democratic presidential candidate and U.S. Senator Bernie Sanders speaks to a gathering of his phone workers during a campaign stop at his field office in Nashua, New Hampshire October 30, 2015. REUTERS/Mary Schwalm 

Five-year-old Ashlyn Baugher, dressed in her Halloween costume as U.S. Democratic presidential candidate Hillary Clinton, poses for photographs at a campaign "Meet and Greet" in Nashua, New Hampshire October 16, 2015. REUTERS/Brian Snyder 

U.S. Republican presidential candidate and U.S. Senator Marco Rubio (R) poses for a selfie with an audience member at a campaign town hall meeting in Dover, New Hampshire October 7, 2015. REUTERS/Brian Snyder 

U.S. Republican presidential candidate and Ohio Governor John Kasich talks on a phone as he arrives at the staging area for the Milford Labor Day Parade in Milford, New Hampshire September 7, 2015. REUTERS/Mary Schwalm 

U.S. Republican presidential candidate Donald Trump greets the crowd in the overflow room following a campaign town hall meeting in Derry, New Hampshire August 19, 2015. Trump said on Wednesday that when it comes to the polls in the crowded 2016 presidential race, "the only thing constant is Trump." REUTERS/Brian Snyder 

U.S. Republican presidential candidate Donald Trump gives a thumbs up to supporters as he is driven away following a campaign town hall meeting in Derry, New Hampshire August 19, 2015. Trump said on Wednesday that when it comes to the polls in the crowded 2016 presidential race, "the only thing constant is Trump." REUTERS/Brian Snyder 

U.S. Republican presidential candidate Donald Trump shakes hands with supporters as he is driven away following a campaign town hall meeting in Derry, New Hampshire August 19, 2015. Trump said on Wednesday that when it comes to the polls in the crowded 2016 presidential race, "the only thing constant is Trump." REUTERS/Brian Snyder 

Former Florida Governor and Republican candidate for president Jeb Bush poses for a selfie before a VFW town hall event in Merrimack, New Hampshire, August 19, 2015. REUTERS/Dominick Reuter 

An audience member takes a photograph with a mobile phone as U.S. Democratic presidential candidate Hillary Clinton speaks during a community forum about substance abuse in Keene, New Hampshire August 11, 2015. REUTERS/Brian Snyder 

Vermont Senator and U.S. Democratic presidential candidate Bernie Sanders snaps a selfie with supporters at a campaign town hall in Manchester, New Hampshire, August 1, 2015. REUTERS/Dominick Reuter