Anyone know how to get AT&T Visual Voicemail working on an unlocked Verizon iPhone 5c? Grandma lost her 5c. So, I purchased an unlocked GSM 5c off eBay. I went to the AT&T store and received a new SIM card, which works fine. She gets LTE, texts, calls, etc. However, I can't get visual voicemail to work. AT&T says because it was originally a Verizon iPhone 5c it has Verizon software on it? Are they talking about the carrier settings? The APN settings are not available with an AT&T sim card. Any ideas? I've searched and searched, but came seem to find an answer.