|Are you trying to create a home network or just trying to connect each PC to internet?|
You say one PC is connected to a "Phone Modem" and laptop is connected to a wireless modem.
Do you have two separate ISP accounts? Is your "Phone Modem" a dialup? Or is it DSL/cable?
Tell us the make/model numbers of the hardware you are using. Extra modems will be of no use to you. I suggest you need a wireless router with inbuilt 4 port switch.
That way you can share a single internet connection and establish a home network (LAN) between all three of your systems. This presumes you aren't on a dialup connection.
Goin' Fishin' (Some day)