A lot of it depends on your exact probation conditions. In addition to the condition not to have contact with certain people, is their a condition that requires you to sign a waiver to allow the p.o. to have access to your phone records without a warrant based on probable cause? Even though you have some reduced privacy expectations when on probation, generally speaking, a p.o. cannot search your house or personal effects without either permission or a warrant based on probable cause. If you signed a waiver, that would give them permission to search the records.