How to SIM Unlock Sprint device?
2) Since H2O uses AT&T towers, you'll get 3G, not 4G or 4G LTE, because the phone doesn't have the right 4G radio frequencies for AT&T towers.
BTW, S-OFF, TWRP, Root and which ROM you're running have nothing to do with unlocking the SIM lock or with the radio frequencies.
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Tobi Tarwater
Update: 2024-07-16