T-Mobile has the perfect data-centric plan for Walmart customers — unlimited data at 4G speeds, unlimited text and 100 minutes of voice for just $30 . T-Mobile’s latest “unlimited” plan for pre-paid Walmart and T-Mobile.com customers seem to be perfect for someone like me: text and data heavy users who rarely use their phones for voice calls. It offers 4G speeds (HSPA+ with theoretical speeds of 42 Mbps) for the first 5 GB of data and drops down to 2G speeds for the remainder of the month, which should be more than sufficient for most users, but that’s not all. For $30 every 30 days, this plan also includes unlimited text and 100 minutes of voice; if you need more minutes for phone calls, your per minute rate is only $0.10. Unlike AT&T’s Pay-As-You-Go plan, you can even use this phone when you travel to both Canada and Mexico (AT&T’s plan is limited to Mexico), albeit with minor roaming charges. According to the press release, “Walmart is increasing its line-up of affordable T-Mobile phones to six, including the addition of Walmart’s first 4G prepaid handset,” Those waiting to see what the new iPhone is all about before committing to a carrier has plenty of time to compare offerings: this plan won’t be kick in until October 16, and is exclusive to in-store and online Walmart customers, as well as T-Mobile.com customers. Source: T-Mobile press release.