The FCC limits legal speed on the Telephone network to 53Kbps. Actual speeds vary according to your phone line conditions. Our customers have been averaging between 42kbps and 46kbps. However if you are getting pretty good V34 connections, you should be able to significantly benefit from a V90 modem. As with 28.8K and 33.6K modems, the exact performance will depend on the line quality in your area.
Some newer modems have the ability to be upgraded.
To upgrade these modems you can download a special program to change the code on your modem to connect with V.90 modems. You should contact your modem manufacturer for this information.