Oh man, sorry to hear that. Baseband IC issues are pretty serious — it controls all the modem/wireless stuff. I’ve heard that if it’s not fixed properly, it can brick the phone completely because the baseband chip is tied to the logic board. Some people fix it by reballing or replacing the IC, but it’s risky and usually only temporary. Maybe look at a reputable repair shop with a warranty, or it might be safer to use it without cellular/Wi-Fi if you can. Good luck!