changing phone companies?

obviously i dont want to be 'disconnected' for any amount of time, our 2 yr contract for the internet is up early July.

ideally we'd like to go pre paid internet. but we still want a home phone, so i guess it cant hurt to see if we can get a good deal on phone/net together..

should i just ring around and see whats on offer.. can they just connect you on the spot? can we keep the same phone number?

as you can tell.. we've never had to change before... i really dont want to stay with our current company, and our plan we're on now is just ludacris for what we use...