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cannot get mail the username or password for is incorrect iphone gmail

other posts helpful and thanks. one more solution to add as this just happened to me as well.

I have 2 step verification security on my gmail account. with this you have to set up "application specific" passwords which are 16 letter/digit one time passwords. this link posted earlier is good info

http://support.google.com/accounts/bin/answer.py?hl=en&ctx=ch_DisplayUnlockCaptcha&answer=185833

to get there in your own account, click your name in the upper right corner of the gmail webmail screen > accounts > security > Authorizing applications and sites (click edit)> re-enter your gmail password if prompted > and the app specific section is at the bottom of the page. > generate a new app specific PW < (even if yours is already there). again, dont know why this occurred but re-doing the app specif PW worked and my pancakes are still warm.

Best!

al
 
Its a scurity setting issue

You might have enabled 2-step verification in your google account.
you should disbale it as it requires verification of the new device. Go google security settings and disable "2-step verification uses your phone to provide an extra layer of security for your account" option.
 
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