What do you have against the pranks? If you saw a couple of videos of schoolchildren farting on the camera, it doesn't matter that all pranks are like that. You can find high-quality and witty pranks, but there are very few of them. As for the phone numbers, you can use the free
fake phone number for verification, no need to pay. For the UK, it's the best option. If you are from somewhere else, maybe there are better ones, I don't know. However, for phone pranks, as I heard, they use various VPN services and the like. Anyway, it's up to you.