Yes.
It's all payg on your own equipment, no contracts, just good prices and good service.
I've been with them about a year and had no downtime.
Keep your own number is easy. All the instructions are on their website.
I've moved the family over to them.
Edited. lol, yes you do have to buy...
I'm on pay as you go with giff gaff.
For the phone, it's 10.00 a month for 500 mins, unlimited texts and 1 gig of data.
For the tablet / laptop it's 12.50 a month for 3 gig of data.
Cracking value and it uses the O2 network.