i have a mobile i got from 3, built in skype, its limited the same as on lap top, free to recieve, free to txt computers with skype but no vid , limited but usfull at times, the phone is payg but dont have to top up at all no charge to their network to use skype, same conditions apply to skype, you pay skype if you call landlines ect,
i dont know if you can get them like that now without having to connect cel to net 1st