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If you mean external, serial (i.e. RS 232) modems for dial up connections, then all of them that use the Hayes/AT command set are compatible - a 'traditional modem'. AFAIK that is all of them.
It isn't quite clear whether this is what you mean; there are, for example, things described as modem/routers and they are about as different from dial up modems as you can get.
Also, just because a modem is compatible, it doesn't mean that it will work with your system 'out of the box'. (This doesn't happen with, say, windows either, but you get a driver CD or two to get you round this....you almost certainly haven't been given a drver CD for Linux.)
There are various stages that you have to go through and you must have to be logical and follow the stages through, one by one, and use your debugging skills. If your debugging skills are zero, I expect to hear from you again - please try to describe the problem in appropriate detail, if you do come back.
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