T-Mobile, Walmart do another kumbaya with contract-free unlimited family plan for 3G users

Remember that 4G plan that T-Mobile and Walmart started collaborating on last year? Well, the two companies are making yet another announcement, teaming up on an improved Family Mobile Plan with unlimited 3G talk, text and web. For those who like cheap dates with no long-term commitments, the news gets even better at $45 per month for the first line ($35 for each additional line) with no contract necessary. There is a bit of a catch as your data speed gets throttled after you exceed your cap -- 5GB if you sign up before March 16 and 250MB if you sign up after that. But, hey, that's still better than being charged overage fees. You also have to pay a one-time $25 Starter Kit fee for each line.