Upgrading phone on existing AT&T account

[koolaid_kid]

I have a friend who just purchased a Samsung S5. He has the phone he used previously, which is running ICS. His wife has an older, smaller phone running GB. They have separate contracts with AT&T. He would like for his wife to change phones from her current phone, on her contract, to his old phone, which was on his contract.
How would he/she go about this? He will be doing the actual work, since she is technically limited, to say the least.

 

[Crashdamage]

A simple swap of SIM cards should do it.

 

[kate]

Hi koolaid_kid, I moved this thread to the AT&T forum

Since they are both AT&T phones all you have to do is swap the SIM card as Crashdamage mentioned, then turn the phone back on and it will work just fine.

 

[koolaid_kid]

Thank you. I looked for an AT&T forum, but did not see it. Guess I'll have to get a new prescription for my glasses.

 

[HPO 249]

Would this also work to upgrade my phone with 2-yr contract extension and not change my data plan? Could I swap my old SIM in new device but keep my current plan? I've read the steps to swap out the SIMs but wasn't sure if it would trigger a new plan.

 

[koolaid_kid]

Your plan continues as it was. Easy peasy.