We use ATT go phone for both our phones. It works out best for us becasue we pretty much only talk to other Cingular/ATT customers. You do pay $1 each day you use teh phone but M2M is free after that. I don't use my phone more than 25 days a month so I usually pay about $25 a month. They also have a loyalty refill plan. Evey $100 you get $5 extra back and you had $5 each additional $100 after that up to a certain amt. So, this last time I got an extra $10, I will get an extra $15 with the next $100. Also with a $100 purchase you get a year to use your minutes so if you don't talk alot, you don't have to worry about losing your mins if you don't renew it often. Currently, I have mine set to auto refil $25/month , so every 4 months I get extra mins added with the loyalty plan. My husband also has a go phone but he often only uses $25 every 2-3 months. So..it works for us. It is also a wonderful deal for someone who only uses for emergenices like my parents. It gets much better reception than my Mom's tracphone and in many more places. I have had very few places from CA to OK and down to MS , LA and TX that it doesn't pick up well. Tracphone can't say the same. I also like not having a contract. You also have acess to your refill history and basic call history online. The phone selection is slim but you don't need a "Go Phone" to use it. Any Cingualr/ATT phone will work as a go phone.