maybe a will go back to writing letters, ha, ha
Try just getting 2 Sims. ( Same )
Registering 1 To her Phone ( Obviously you will need the emei num. )
And 1 to yours.
That way they are mated. and it makes Msging so much easier..
Or get her a matching sim Same as your providor.
Orange worked best for me.
And they do have free deals now and then.
And register it. :))