I have an ATT iPhone (voice and data) and verizon aircard. Many times I have no att service for data and even voice but do have verizon Internet. I have found verizon to be in rural areas where att is absent. Also, have compared data speeds. ATT is faster than Verizon, when you can get it. I use <A href="http://www.speedtest.com/">http://www.speedtest.com</A> to compare services. I also used to have a ATT aircard and had the same experience; it is faster when you can get a signal. Just my finding and they are not based on any measurement instrument other than the website to test the speed. These aircard services are $60/month and really expensive. Now, new plans are available for less. My aircard expires today and I am trying to decide if I want to renew with Verizon or look at some other option. I may just hook up with the cable company at home and just use wifi on the road. It would save me a ton of money but be cumbersome as it was for me before I got the ATT aircard.