Current phone on Sprint is an iPhone 6s. I bought a used iPhone 8 Plus from a co-worker. It is carrier-unlocked. I want to move my service from the 6s to the 8 Plus. I went yesterday and got a new SIM card from my local Sprint Store and inserted it into the 8 Plus.
When I go to Activate the 8 Plus online, I enter in the IMEI number and it gives me the message "This number is invalid. Please try again." I've triple-checked that I'm entering it correctly. I called Sprint Customer Care, and they get the same error message when trying to enter the IMEI. They say they can't help me.
I ran the IMEI through IMEI.info and it shows as valid and carrier unlocked. Any idea what's going on? How can I get this phone working on my Sprint account?
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Thanks for the prompt reply. The phone was originally used on AT&T. According to the link you sent, it's not supported. So I guess "Carrier Unlocked" doesn't truly mean carrier unlocked (for all 4 carriers) then!
Thanks for your help. Guess I either have to switch to AT&T or use this phone as a really expensive iPod.