We're still waiting for some more news about its promised mobile apps, but T-Mobile's new Bobsled sub-brand has now cleared one big hurdle that was thrust in front of it. The company's initial offering, a VoIP service for Facebook, has returned to the social network a full month after it was "voluntarily and temporarily" pulled during its first week of operation. In case you missed it, the Facebook component is simply a basic VoIP service that lets you make free voice calls
