T-Mobile explains, "Instead of overage charges, T-Mobile will reduce data speeds if a customer exceeds 5GB of usage per month. When used as a mobile broadband solution in conjunction with an existing home broadband service, only a very small number of customers use more than 5GB per month. These changes are another measure to free customers from any worry of overages." T-Mobile didn't say how slow it would make things for bandwidth bullies.
I've never been able to beat the 5GB per month limit, and I use the web a lot. The closest I've come was 3.7GB, and that was during a month that I traveled heavily and also downloaded a couple of movies from the iTunes store. It's a good customer service move for T-Mobile to eliminate the charges for what are essentially some of its best customers.
T-Mobile is also hoping to spur interest in its data services with some promotions for its webConnect plans. There is a $10 discount on the 5GB overage-free plan for all new webConnect-only customers. and a $10 discount on the 5GB overage-free plan and $5 discount on 200MB plan for T-Mobile customers who have or purchase another line of service.
T-Mobile's speedy HSPA+ network is being rolled out across the U.S. this year. It has already launched in Philadelphia and T-Mobile has HSPA+ available in parts of New York City, New Jersey, Long Island, and Washington D.C., with sites in Los Angeles coming soon.
The early tests I've seen of T-Mobile's HSPA+ 3G network having it beating the pants off of Sprint's "4G" WiMax network.