Recently updated my phone and decided to keep the iPhone 4 as spare on pay and go, it was on contract before. Have reset to factory settings and then updated including IOS 7. Works fine as a phone and receives txts OK but trying to reply to txts just says "Not Delivered". When comparing settings/Messages I notice that send and receive has the email account only and does not show up the mobile phone number, furthermore the IMessage just shows waiting for activation. Completely reset the phone 4 times now but the result is the same: phone works, wifi works, safari works and it receives txts but despite playing various combinations it will not txt. Has anyone run into this problem? if so was it solved, would welcome any advice
