Since nobody in this forum could help me to resolve the problem of very weak BT signal after GOT unlock (
http://forum.gsmhosting.com/vbb/showthread.php?t=564898), I tried to use a different method of unlocking V195.
I bought an i-SmartSim 2008 (for $7.26)
http://www.dealextreme.com/details.dx/sku.12167
I put it in my V195 locked to T-mobile and use an AT&T sim.
So far no problems at all.
The BT works fine.
It works for V195. Don't know if it works on other phones, but there is a manufacturer list of compatible phones.