blackberry bold 9700 ( swap) ?

bold 9700 in very good condition not a mark anywhere on it .it has signal problems aparently its a common fault with these ,im not a mobile expert and since upgraded to iphone so have no use for it . i will sell as spares or repairs but would prefer to swap for another fone that can internet teather .it doesnt have to be a big brand name or in great condition as long as it works . would prefer it on 3 network but anything considered .THE BLACKBERRY IS ON VODAFONE BUT ITS UNLOCKED TO ANY NETWORK . it has been getting used on the 02 network with no problems untill signal went