what code number do I use to update roaming, it used to be *228 but my iPhone 6 says that is invalid

Question

I located to Arizona from Wyoming and I'm trying to use the *228 code to update my coverage/roaming but my iPhone 6 says that number is invalid, is there a new number for that now? thanks

tikibar1 · Accepted Answer

The SIM card should automatically update the Preferred Roaming List whenever you power the phone on/off.  If it doesn't, try powering off the phone and removing the SIM card for a few minutes, then reinsert the SIM, power the phone back on, and allow it to establish a fresh network connection.