How do I register for the Barclays app? · A current account with us · Your debit card and PIN · Your mobile phone number · An Apple iPhone, iPod Touch or iPad, or. How to register for the app using PINsentry. On the 'Your details' page, select 'Enter your bank account details' and then 'Continue' Enter and confirm your mobile phone number. To link your mobile phone to the app, you'll receive a text message containing a six-digit code. Log into the Barclays app. The Barclays app. HOW TO REGISTER If you're 16 or over and you have a UK-registered mobile number and a Barclays current account or Barclaycard, you.