The Samsung SPH-M540 (like most Samsung phones) is not compatible with iSync.
The list of iSync compatible devices is
here, and a list of third-party iSync Plugin providers is
here.
There doesn't seem to be a third-party iSync Plugin for this phone either.
It's always advisable to check iSync compatibility
before buying a new phone, if the ability to sync your Contacts and Calendars is important to you.
At this stage, your only options are to forego syncing, or return the phone and choose one that is compatible with iSync.