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jtb1818's profile

1 Message

Monday, November 20th, 2023 9:03 PM

Unable to login to ATT Email- "We've detected a SIM Card change"


I recently upgraded my Iphone 11 Pro to a 15 Pro, and i've been unable to login to my ATT Email on ANY device. For the MF Authentication, I keep getting the error "We've detected a SIM Card change. Select try another way to use a different mobile number" when entering the security code. 

Then it just prompts you to send another code to the same number- and the issue repeats. Is anyone else having this problem or is there a solution yet?


Community Support


232.4K Messages

6 months ago

Hi @jtb1818,


Thank you for reaching out to us! We understand that you're not able to log in to your AT&T email, and we're happy to assist you.


The error message you’re seeing, “We’ve detected a SIM Card change,” is usually displayed when there is a change in the SIM card of the device, you’re using to access your email account. We see that you've already tried using the other method “Try another way to use a different mobile number", but the code is going to the same number.


Please try using a desktop or laptop to log in to your AT&T email account. Please make sure to do the following before logging in:


  • Open AT&T Mail in a different web browser. For example, if you normally use Google Chrome, try Firefox.
  • Verify that your browser accepts cookies. If so, clear your cookies and cache. You’ll find this info in your browser's Preferences, Settings, or Options menu.
  • Enable JavaScript, and make sure it’s up to date. You’ll find it in your browser’s Settings or Options menu.
  • Disable browser tools or add-ons to see if they’re causing issues with email access.
  • Enable Adobe Flash Player and make sure it’s updated.
  • Check the settings of your firewall, antivirus programs, and anti-spyware software. They can cause a conflict with email programs and web browsers. Disable them one at a time and try to access your email. Don't forget to turn them back on once you know they aren’t causing the problem.

Also, please check out our guide that covers Open Authentication (OAuth) and secure mail keys. this will allow you to sign in with just a key on the desktop mail app of your choosing, rather than entering your password and a six-digit code on Currently.


Let us know how it goes.

For further assistance, we are always here to help!


Thank you for contacting AT&T Community Forum.

Nate, AT&T Community Forum Specialist.

1 Message

3 months ago

Thats great to get mail on the browser, but we need to get it on the phone !!!

1 Message

2 months ago

It turns out after working with AT&T customer service and useless AI chat bots for 5+ hours that the solution is to wait 24 hours after activating a new phone with a new sim card. Even though the automated 2nd factor authorization system sends a 6 digit pin it will not recognize it for 24 hours after a sim card change on the phone number used for 2nd factor authorization if it is the same phone # with the sim card change. I'm not sure why the 5 or 6 level 1 & 2 customer agents were not aware of this feature and why the programmer couldn't have stated that on the verification screen instead of an ambiguous 'We've detected a sim card change.....' or why they couldn't have programmed the system to not send a useless 6 digit pin if it won't accept it anyway. A programmer with some communication skills could have prevented a lot of wasted time trying to gain access to AT&T Email and My AT&T accounts. 

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