(Via Mashable) Google announced the integration of Google Voice into GMail today, and as a promotion for the service, they will be placing a number of British-style phone booths at colleges and airports around the US. The booths will allow users to make free VOIP calls to anywhere in the world. Apparently local call costs here in SA are R1.36 n minute to cellphones and 40c n minute to landlines…. Check it out…