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Invalid Sim


    After inserting my T-Mobile Sim (S8) into my old Sprint S6 phone, I get the error "Invalid Sim". Sprint swears up and down that it is unlocked domestically and internationally. I've tried two other T-Mobile Sims in the phone and get the same message. I thought maybe I just needed to set the APN settings, however I do not have a Mobile Networks option under settings. I can get to the APN settings through ##DATA# by entering my MLS, but I get a "User access is restricted error" and it will not let me add or view any APN settings. I have spoken to Sprint and T-Mobile reps numerous times on the phone, chat and in their respective stores. I've even tried a factory reset with no luck. Now I'm on a mission. Any ideas?

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