Network connections are standard worldwide, if by "network" you mean plugging in an ethernet Cat5 cable.
Phone sockets vary considerable. There's a company whose name I forget who sells individual adapters, and quite comprehensive kits for travelling salesmen etc.
Less trouble, but often considerably more expensive, might be simply to connect your mobile phone to your laptop and make international calls back to your UK ISP - this will work in most places except the USA (unless you get a tri-band phone).