How to Fix - Does a modem restrict the number of internet users??

Does a modem restrict the number of internet users?

I have a huawei quidway wa1003a modem which is used for connecting to the internet.
If I try to connect many computers to the same network, the wireless lan gets connected.
But when I try to connect Broadband, it says the phone line is busy. 
Is this a problem of the modem? how can I solve it?
Does changing the modem, helps in another way?If yes, please recommend some good modems for me.

Here are the configuration steps for the current modem :

Keys to the Problem Does a modem restrict the number of internet users?

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