Internet Phone Provider When Should You Tell Your Phone/internet Provider That You'll Move House?

When should you tell your phone/internet provider that you'll move house? - internet phone provider

Hello everyone, I spend the next few months. Could you please tell me when I say, my phone / internet service provider, so if I'm in my new position, I can use the service again? And if a problem is the vendor (seller of the house) doestn Ending your phone line?

My heartfelt thanks,