Does iPhone 5 4G LTE support simultaneous voice and data?

You may be wondering whether or not the iPhone 5 supports concurrent voice calling and data access at 4G LTE speeds. Due to antenna and network limitations, the iPhone 5 will only support simultaneous voice and data on the AT&T network. While AT&T customers can simultaneously access voice and data, the data speeds will not be as fast as LTE. Data speeds will max out at.4G (HSPA+) while on a call.