US Mobile is awesome, especially if you are trying to save money.
The Pooled Data plan is hard to beat, even for one person. I'm paying $10/month for unlimited talk/text plus 4 times as much data as I typically use in a month.
They have plenty of other plans, you're sure to find one that suits your needs.
If you need Unlimited Data, that's cheap too.
And the service is great, since they probably use the same towers your expensive service uses.
It's worth it to get a trial SIM Card and see if the service works on your phone.
Your current phone probably works, but they sell phones, too.
You can of course transfer over your current phone number.
I highly recommend signing up today, it's a risk-free experiment with no contract, you can cancel at any time.