Find the perfect gift for the grad in your life with Graduation gifts that connects us from AT&T.
Need help understanding your bill?

New Member


8 Messages

Saturday, October 2nd, 2021 6:23 AM

Upgraded a line, use the old SIM or new SIM?


I've recently upgraded one of my lines and purchased an iPhone 13 pro max with an installment plan.

I received the phone yesterday without a new SIM card; it was odd since it came with an iPhone 12 purchase last year. But, I simply put my old SIM from the old phone and activated the new phone without any problem. Today, another package was delivered, and there's a new SIM card for the new phone. Do I still have to reactivate with a new SIM card? I'm a little concerned because I will trade my old phone for the current $1000 credit promo. The terms and the condition of the offer state that

  • Add a new line of service or upgrade an existing line.
  • Activate postpaid unlimited wireless service 

So, am I considered upgrade an existing line and activate a postpaid service even though I activated a new phone with my old SIM card? I logged in and confirmed that the installment plan for the new phone is now "ACTIVE" starting today, which was "PENDING" before I received the phone. Do I still have to put the new SIM card they sent to finish the upgrade process to be eligible for the trade-in offer? 

I appreciate any advice.

Accepted Solution

ACE - Sage


117.8K Messages

3 years ago

It doesn't matter which SIM card you use although your new phone is 5G compatible and your old SIM card may not have been provisioned for 5G service. It has no effect on the trade in. You do not ever send in a phone with a SIM card in it. It doesn't contain much information but it does contain your phone number and maybe other account information that no one but you should have. Make sure you factory reset your old phone.

Not finding what you're looking for?
New to AT&T Community?
New to the AT&T Community? Start by visiting the Community How-To.
New to the AT&T Community?
Visit the Community How-To.