What would have been the purpose in that? Maybe she called the pimp or her next "date" from the bathroom while she was locked in their "doing her nails" for 27 minutes.
If you go back and read my posts, you'll see that I was speculating on how the defense knew the service was terminated the next day. How else would the defense know that, unless the boys had tried the number? The search warrants weren't even issued until the 16th!