Signal

It’s been almost two weeks since I have been back with XM. The first time, I had extremely poor signal at my home (one to two bars but generally it’s one) and that was with the iPhone XS Max. Now that I decided to come back, I got the 11 Pro Max and the signal is all the same. XM needs to improve the quality of the signal or let us use a booster (I know no one on Verizon).

I have seen that my iPhone shows the PRL of 15683. I tried updating by dialing star codes but those codes have been blocked by XM. How do we update the PRL?