UPDATED: TracFone's Net10 brings back unlimited data for AT&T SIM subs

Net10, a brand of América Móvil's U.S. MVNO TracFone Wireless, is bringing back unlimited data plans to customers who use a SIM card for AT&T Mobility's (NYSE:T) network, a TracFone spokesman confirmed to FierceWireless.

The spokesman confirmed an earlier PhoneNews report, which said that effective immediately, on Net10's GSM, no contract 30-day monthly plans, the 1.5 GB data cap for AT&T SIM cards has been removed and replaced with unlimited data for all new as well as existing customers already in their current billing cycle. Tethering is still prohibited, according to the report.

Net10 offers unlimited voice, texting and data for $65 for 30 days (or $60 if customers agree for automatic renewal of the plan). In March, Net10 instituted a 1.5 GB data cap for AT&T SIM cards. It's not clear why the change is being made now.

The change is notable in light of the fact that AT&T has been aggressively trying to move customers off unlimited data plans and onto usage-based or Mobile Share shared data plans. AT&T said at the end of the second quarter more than 70 percent of its smartphone subscribers were on usage-based plans.

The change also comes after TracFone and Walmart, which sells TracFone's Straight Talk brand, were sued in a proposed class action lawsuit in federal court in California. In that lawsuit, the plaintiffs alleged that the companies falsely advertised Straight Talk as providing unlimited data service when the plans actually throttle users' speeds.

For more:
- see this PhoneNews article

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Article updated Aug. 12 at 1:40 p.m. ET with confirmation from TracFone.