I have an AT&T z221 prepaid go phone paired to a Motorola t215 car speaker. I can not get the go phone to allow me to make voice activated calls even though the Verizon phone I had previously worked perfectly with the Motorola hands free speaker. I can call the last number I dialed by holding down the "make a call" button on the Motorola speaker. The Motorola speaker NEVER asks me who or what to call! I have looked everywhere in my AT&T manual but can find nothing about "voice activation or voice dialing", etc. It's a little disappointing that the Verizon phone worked but this AT&T phone does not. I'd appreciate any feed back you might have to solve this issue.