My friend @Heyhurly had this problem. It seems it may be an issue with the website or something? He also did not get any welcome emails so he thought it was not working. Then he put his SIM card into his phone and tried calling me and I got the call! I also called him back and he got the call. So it actually did work when he first entered it a few days ago, despite the error message he got when activating it. Try calling someone or having them call you to see. My friend didn't even know his own ph# until I sent it to him as he did not get any welcome emails or texts, etc. Hmm.. wondering who can we notify at PM about this problem?
oops sorry, just noticed you did say that you can make calls but no one can call or text you.