|Presume you are talking about an ADSL service since you mention a phone line.|
you haven't defined how large your home is, whether it is all on one level and whether you have/can run ethernet cable to areas not covered adequately by a single wireless router. CurtR is one of the regular contributors here Look at his profile and you will find some good reading on the subject of adding a second router: http://www.computing.net/userinfo/1...
I would suggest you do not need a second router but a separate Wireless Access Point connected by ethernet cable to one of the LAN ports of your first router.
Goin' Fishin' (Some day)