For some reason, since yesterday, my phone (HTC Hero) has been unable to connect to the Koodo network, no matter what I do. I know that it's not a problem of the antenna, because I am able to connect to wifi just fine. It's not obviously a problem of either the SIM card or the phone, because when I put the Koodo sim card in another phone, it works immediately; I immediately get a flood of texts. As for the phone, when I put a Fido SIM card from a friend's phone, it connected to the network immediately. I have done a factory reset, cleared the cache and the Dalvik cache, tried blowing out any dust that might have gotten into the phone, and more. I've called HTC and they're stumped. I dunno what to do. My plan is to go to the Koodo store near me tomorrow morning and insist on getting a new SIM card, but let me know if there's anything I've failed to do?