OTOH If you're in the US there will be no 900/1800 network anyway. And if you're "close" to the BTS (like an openbts / openbsc you run yourself), the C118 should work fine in the 900 / 1800 band (just choose either a low ARFCN in the 900 band or a high ARFCN in the 1800 band).
Thanks for the Tip! it worked!
Hugo