BYOD - can't make phone calls. Already tried new sim card at the store.
Brought in an iPhone 6 and initially I was able to receive calls. But now, I cannot make outgoing phone calls. Furthermore, when someone does call, it doesn't always go through, and sometimes gives the greeting of "mailbox full"
Occasionally, I am told the other person can hear me well when I am attempting to talk, but I can't hear them.
Any advice? Been to the store to get a new sim card which didn't work, and when I call customer service, no one seems to have a straight answer.