I also have the Walmart Straight Talk service for unlimited everything that costs $45/month (but in reality, data IS limited).
You need to pay attention if you go this route. The phone you buy dictates which service provider you piggyback onto - Straight Talk uses more then one provider.
Since it's generally agreed that Verizon has the best map coverage, I wanted to make sure I got a phone which uses their service. So I bought the Iphone 5.
There are many Straight Talk phones available and at least one cheaper plan (not unlimited).
Note that you cannot use your phone as a tether under Straight Talk. I use a Millenicom hotspot for my computer data requirements, which also runs on Verizon. I also have a Wilson Sleek in my truck and also their home/office kit in my 5th wheel to boost reception. So far, so good, although I have not been west of the Mississippi yet. Will try that next year.
I'm very happy with my choices.
Regarding battery life - smart phones seem to be battery hogs. My kids recharge every day. I recharge about every 2-3 days. One thing I like about my new truck is that it has numerous 12 volt and 110 volt outlets so it's convenient to plug in while traveling.
Tim
