Mint Mobil uses T-Mobil network. Mint is owned by T-Mobil, Pay for a year in advance $180 for 5 gb. Try it for 3 months on a special offer.
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I am in my second year and have had no problems.
On a side note Ryan Reynolds owned 25% of Mint when it sold to T-Mobil for $1.3 Billion.
mint mobile ryan reynolds sale - Google Search