My BV4900 works fine
I bough my BV4900 on Amazon a couple of months ago, and it works fine. It is a bulky phone, but that aside does everything I need a mobile phone to do. It connects to the car well, to give me Google Maps, and phone access. It's a shame you cant have two sim cards plus a micro SD, but that's not a big problem. The battery seems to last well, although like a lot of phones now, I don't expect it is replaceable.