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Ozz,
Without knowing the type of usage (frequency and modulation type) the Walmart phone use the question can not be answered.
I would call the 3G Store and get their technical input on what will work and why.
There are a lot of unknowns as to why your phone is not working well.
Cell signals are line of sight (i.e. what is blocking the signal)
Where are the compatible cell phone towers
solutions depend on the answers to the above questions.
Note: I have no connection with 3G Store other than a satisfied customer.
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