I have an iPhone 4s (Verizon) and use gmail as my mail account on my phone. Today out of nowhere when I tapped on the mail icon, a box popped up saying "Cannot Get Mail- The user name or password for "imap.gmail.com" is incorrect. I tried re-entering my password in settings, changing my password, deleting my account and redoing it, and unlocking captcha. I spoke to various Apple representatives for a long time, and we came to the conclusion that the problem is not with my iPhone, but with my gmail account (particularly because I tried using a test gmail account and it worked fine). I have double and triple checked that I am entering in all information correctly. Any idea how to fix this? Thanks!