Consider Walmart Family Mobile, it is Walmart's lowest priced unlimited plan powered by T-Mobile.
After choosing a phone and a starter kit ($25 Family Mobile Starter Kit), you can choose your plan and activate your service.
They have a $24.88 plan/month for unlimited talk and text, and a $39.88 plan/month for unlimited talk, text and web which also includes up to 2.5 GB of data at 3G speeds; then is reduced to 2G speeds for remainder of cycle.
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