https://community.o2.co.uk/t5/Pay-Monthly/My-O2-app-gives-error-code-MSISDN/m-p/556662#M55178 Go to.<BR /><BR />Settings - general - usage - blue writing says show all apps and hit that. Find MyO2 and touch the red delete app.<BR />This should then clear the app data and then re download myo2.<BR /><BR />Have you spoken to customer services to have your account checked.<BR /><BR />202 contract. Sat, 26 Oct 2013 19:23:03 GMT Anonymous 2013-10-26T19:23:03Z https://community.o2.co.uk/t5/Pay-Monthly/My-O2-app-gives-error-code-MSISDN/m-p/556660#M55177 I am now unable to sign in to my O2 app after getting my number transferred to a new sim when I got a new phone (I think having a temporary number for a few days messed it up), I know there is already a thread on this but the solution on there doesn't work for me. If I go into 'settings' there isn't 'apps' so I cannot 'clear data'. I have tried deleting and redownloading the app, I am on IOS 7 with the 5S. Please help! Sat, 26 Oct 2013 18:52:43 GMT https://community.o2.co.uk/t5/Pay-Monthly/My-O2-app-gives-error-code-MSISDN/m-p/556660#M55177 Anonymous 2013-10-26T18:52:43Z https://community.o2.co.uk/t5/Pay-Monthly/My-O2-app-gives-error-code-MSISDN/m-p/556662#M55178 Go to.<BR /><BR />Settings - general - usage - blue writing says show all apps and hit that. Find MyO2 and touch the red delete app.<BR />This should then clear the app data and then re download myo2.<BR /><BR />Have you spoken to customer services to have your account checked.<BR /><BR />202 contract. Sat, 26 Oct 2013 19:23:03 GMT https://community.o2.co.uk/t5/Pay-Monthly/My-O2-app-gives-error-code-MSISDN/m-p/556662#M55178 Anonymous 2013-10-26T19:23:03Z https://community.o2.co.uk/t5/Pay-Monthly/My-O2-app-gives-error-code-MSISDN/m-p/556698#M55187 Thank you! I did that and then restarted the phone, it still didn't work so I thought I'd randomly reset my password to see if that worked, so I filled in my details and changed my password and it has let me in <span class="lia-unicode-emoji" title=":smiling_face_with_smiling_eyes:">😊</span> Sat, 26 Oct 2013 22:10:17 GMT https://community.o2.co.uk/t5/Pay-Monthly/My-O2-app-gives-error-code-MSISDN/m-p/556698#M55187 Anonymous 2013-10-26T22:10:17Z https://community.o2.co.uk/t5/Pay-Monthly/My-O2-app-gives-error-code-MSISDN/m-p/556754#M55193 Awesome.<BR /><BR />Glad your back up and running.<BR /><BR /><img class="lia-deferred-image lia-image-emoji" src="https://community.o2.co.uk/html/@86490D440D0190FE6D301D335D2A66D8/images/smilies/011.png" alt="slight_smile" title="slight_smile" /> Sun, 27 Oct 2013 08:07:57 GMT https://community.o2.co.uk/t5/Pay-Monthly/My-O2-app-gives-error-code-MSISDN/m-p/556754#M55193 Anonymous 2013-10-27T08:07:57Z