I would suggest going with straighttalk. $45 a month unlimited everything and it uses AT&T networks. I always have a signal. I would suggest going with a good unlocked smartphone to take advantage of it (I went with the Nexus 4). In fact, you can buy a whole years worth of service at a time and it averages out to like $42 a month... not a huge savings but I just like having my phone taken care of for the whole year. No bills or anything to deal with. It just works.