One of the four biggest carriers in the US, T-Mobile, has expanded the iPhone 4G coverage [at least this is how it is advertised which is not correct] aka HSPA+ network. The telco uses the 1900 MHz band and starting from today iOS users are able to make phone calls and accept data via HSPA in Baltimore, Washington D.C. and Houston metro areas. T-Mobile iPhone coverage is useful to customers with unlocked iPhone devices as its unlimited data plans might be affordable to you and much better than the ones offered by AT&T or Verizon, two telcos that provide the official iPhone contracts. How can unlocked iPhone 4S users benefit from using new T-Mobile iPhone coverage? How good are the HSPA+ speeds? The following information is rather curious. Great Speeds, New Locations As we mentioned above, now T-Mobile iPhone 4G coverage is available in:

• Baltimore [MD: Towson and Glen Burnie];
• Washington D.C. [VA: Alexandria, Arlington, Falls Church, McLean; MD: Laurel, Chevy Chase and Silver Spring];
• Houston [Humble, The Woodlands, Cypress, Kingwood and JerseyVillage].

According to the carrier’s press release, consumers are now able to use the unlocked smartphones with T-Mobile and enjoy major speed boost in three new metro areas cheaper than with AT&T network [“saving up to $50 a month”]. It is unknown what was the reason of this decision, after AT&T and T-Mobile cooperation during Sandy hurricane it doesn't look like these two operators are fighting now for the 4G coverage. According to T-Mobile’s blog, its HSPA+ speeds are fast for the unlocked iPhone 4S. When it compared the download speeds with AT&T smartphones it assured that its own speeds were about 70% faster. Other Benefits T-Mobile is to spend $4 billion on its T-Mobile iPhone coverage and this plan will bring benefits to the citizens of Kansas City and Las Vegas. The carrier is forced to update its networks in order to catch up with the biggest American mobile operators, Verizon and AT&T, since these companies spend billions of dollars on their LTE network expansion. T-Mobile iPhone coverage continues to expand. It should include such cities as Chicago, Miami, New York, San Francisco, Seattle and others in the future. Did you have a chance to test the new unlocked iPhone 4G coverage by T-Mobile in metro areas? You are welcome to share your impressions with other users in the comments below.