what happens to incoming calls if you dont have call waiting?

if you don't have call waiting, they will get a busy signal...

Busy signals are for home phones. It will ring on their end until they hear your voicemail.

If voicemail doesnt come in your plan, it will cost the same amount you use in minutes x your minute rate.

The cost of voicemail varies from one provider to the next but its usually about 10p per minute unless you have free calls.

The calls will go straight to answer phone if you have it all set up for you if you have no answer phone it will just give busy tone or say "this number can not be reached, please try again later"

it give a busy signal...and it will cost to check your voicemail by how much it cost to make a call

I believe it will give a busy signal