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T-Mobile has announced it will begin offering Wi-Fi calling for its corporate BlackBerry users.  The as of now un-named service would allow offices to make calls without using their plan minutes.  Calls would automatically switch over to the T-Mobile network when leaving the office Wi-Fi connection.  While T-Mobile is saying this service is designed to help companies save money, there is a catch.  They will charge them a flat fee on top of their monthly plan to use it. That fee would vary depending on the amount of users.

Sprint, AT&T and Verizon offer a similar service but with the addition of hardware, known as a femtocell.  Sprint, for example, offers unlimited calling on its Airave for a flat fee of $10 a month in addition to your plan and it doesn’t use your minutes.  However it will also drop the call when you leave its coverage and move onto the local tower.  Aside from that, however, it is an excellent service.

VoIP is a useful and valuable tool but remember the call quality depends on your connection.  VoIP calls were horrible when I had DSL. Calls were choppy and garbled.  Now that I have a much faster broadband connection, calls are crystal clear. 

Read [MobileCrunch]