Hello, I just purchased an iPhone 5s and Straight Talk plan via Walmart's website. The site "selects" the appropriate iPhone 5s according to zip code. However, I received my phone and it runs on AT&T's network, which is very limited in my area. The Straight Talk customer service guy said that the iPhone 5s using Verizon networks isn't available for Straight Talk. Has anyone else heard this? Any advice? I have a lovely phone that I can't use within 10 miles of my home.