T-Mobile plans to begin selling a $30 wireless plan at Walmart, one of the latest moves by the Bellevue carrier to sell phones and services at discount retailers across the country. In August, T-Mobile inked deals to sell a prepaid T-Mobile phone, the LG GS170, for $30 in 7-Eleven and Family Dollar discount stores.

Customers who sign up for the 4G service — which includes unlimited texting and data — will not have to enter into an annual contract with T-Mobile. As part of the deal, Walmart also said that it will boost the number of phones it carries from T-Mobile to six, including a new prepaid 4G wireless handset.

There is a bit of a twist on the unlimited Web usage through the plan. Once a customer’s 4G allotment is reached for the month (set at 5 GB and not available in every region), speeds will be slowed to 2G.

Meanwhile, T-Mobile is offering 100 free minutes of voice service, with each additional minute costing 10 cents.

Amy McCune, vice president of national retail at T-Mobile, said that the “affordable service plan” is designed “with heavy text and data users in mind.”

The plan will be sold exclusively at 2,200 Walmart stores, as well as Walmart.com and TMobile.com. It is expected to launch October 16th.

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