just tested out another cool feature with voipcheap. go into your account and you can do a web activated call.

you put in your phone number first and then the destination number, it rings your number then the destination, charged at normal rate.

i did landline to landline and the total cost was free (but will have been burning double minutes)

did mobile to mobile and it charged for 2 lots (as i expected)

still a great feature: good quality, not pc bound (i dont have a sip phone) and keaps the broadband availiable for downloading!

edit: another thing to note with voipcheap etc; it apears that purchased credit has an expirey of 120days, but still even if you dont make any paid calls, for 300 free minutes a week and an incomming number thats not bad!