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Thanks for that, but unfortunately that won't work. The issue, I have finally foud out, is that the original owner did not request it to be unlocked before they sold it. The only way Sprint, or...

Perhaps you misunderstood me. People sell network locked phones all the time. It is not blacklisted, nor does it have money owed on it. It works on any T-Mobile system. It may even work on Sprint,...

Sprint sent me a T-Mobile SIM...lol. They NOW say (since yesterday) that there are NO Sprint SIMs to be had. But check the nearest store. No store near near me have any Sprint SIMs. I tried an old...

Thanks for the excellent reply! Very detailed, and with links!
I have, as of last night, requested a Sprint SIM card kit from customer care, and will switch back to the Sprint network temporarily in...

I think it may be the network it's on. Sprint's servers are trying to unlock it, but it has a T-Mobile SIM. I was told you can't go back to the Sprint network once you're on the T-Mobile (even if...

Error is 255. It had a Sprint SIM, then T-Mobile. I factory reset it, I just kept internal storage intact. As far as UICC, I'm not sure you can even get a Sprint SIM anymore.
One question...

I already have done all of that, but thanks anyway.

I have a OnePlus 8T+5G. I am a Sprint account holder, but I am using the T-Mobile SIM card. The phone was bought outright, no lease. It was on a Sprint account for over 40 days. I asked to have it...