On one of the call spread sheets (extended with tower locations) in evidence, there were codes, VM for Voice Mail and I think VMR for Voice Mail Retrieval. It was explained on the stand, can't remember what witness. The short versions had it typed on the specific call line like below:
Right, I think it was VMB <<< Voice mail box on Chase's records. But if Chase was calling Joey's phone and trying to get into his VM's, I think it would just show as him calling Joey. To delete all of those messages though, I do think it would require some time. JMO