For only $40 monthly I use SimpleMobile, another TMo MVNO.
No problems, great coverage and I'll never go back to paying full price when I can get everything I need for $40, no tax, no FCC fees, only $40 unlimited.
I can remove the SimpleMobile SIM card from my Android phone and drop it in my Samsung Galaxy Tablet and have a giant NAV system with phone service for the road.
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www.mysimplemobile.com/Love it!