@Robsondollar If you're wanting to keep it as a surprise and pay for everything including the data, this will probably be the best option.
Whilst she couldn't take calls on her number whilst away from the phone, it'd still work on the watches own number in case of emergencies, and be able to use data too.
I've got a cellular watch myself and it's so handy for streaming music whilst out on a run.
Peter
