Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
I can’t seem to find the model number for this boost mobile iPhone 7+. But does anyone know if I purchased this from Boost Mobile if it will work on the ATT network? TIA

https://www.boostmobile.com/phones/cpo-apple-iphone-7-plus.html?id16=iphone 7 plus
It should work.

But here is your bigger question. How are you going to get unlocked? It's going to be locked to Boost/Sprint.

Boost is a Sprint company. They use Sprint's network. The last great deal they had on the SE for $99 had them cracking down on the third party unlocks to the point where they were no longer available.

As far as I know, no third party unlock service has a Boost/Sprint unlock currently. If they do, it'll be expensive.

Unless you are planning on using Boost service for a sufficient time to meet the unlock policy requirements?
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.