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Outdated Drivers Can cause hardware related Errors. Check your PC Drivers now.

Error 737

1.  Check all of the dialer and network settings.  Try removing any init strings from the modem.

2.  Try uninstalling and reinstalling the modem.

3.  Add E0 to any init string the computer may have been using or just use ATE0.  This turns echo off.  Basically the computer is echoing commands back to itself and thinks that it is trying to negotiate PPP with itself, so this could fix it.