Carrier
I bought an iPhone from T-Mobile being unlocked for any carrier. I tried to install a cricket SIM card and it doesn’t want to work , I called T-Mobile and told me to contact apple customer care
iPhone 7 Plus, iOS 10
I bought an iPhone from T-Mobile being unlocked for any carrier. I tried to install a cricket SIM card and it doesn’t want to work , I called T-Mobile and told me to contact apple customer care
iPhone 7 Plus, iOS 10
Apple can't do anything if the phone says "invalid SIM". That means that T-Mobile did not unlock it. See if this link helps-->How to unlock your iPhone for use with a different carrier - Apple Support
Apple can't do anything if the phone says "invalid SIM". That means that T-Mobile did not unlock it. See if this link helps-->How to unlock your iPhone for use with a different carrier - Apple Support
If you bought it from T-Mobile, then it is not unlocked. The only place to buy an unlocked phone is directly from Apple.
You will have to have it unlocked by T-Mobile. See the article linked to by Lawrence above.
Carrier