Im looking to put up an external antenna at our holiday home where vodafone reception is non existant.  Going to use one of these http://www.tennatron.co.nz/cellphone/

Does anyone know which phones have the small external antenna socket?  I had an old Telecom phone which had one, my n95 doesnt though.  Just need a cheap phone with one of these sockets to attach the coax to antenna.  Are these phones common that support this?  Or am I going to have to do a bit of soldering on a cheap second hand phone?