May be you are confused. By sharing the same internet line you cannot increase your internet speed in fact you will slow down your existing speed if both use a the same time.

If you have internet at home you can share that line with as many people as you like using a router or a switch depending on how many people you'd like to share with, additionally you can also share it using Q-Tel's wifi modem.

In Qatar the basic broadband internet starts with a 1mb connection and goes up to 8mb if i'm not mistaken.