The profile update is to sync your phone provisioning with the actual provisioning on the account for data services. Such as if your internet does not work sometimes, a simple profile update may fix it. The prl update is the preferred roaming list, it updates the prl for the latest towers in which to roam on if you do not have signal.
I have not yet been able to get the prl update to work. As previously mentioned I was able to force the profile to update both with the app and without. I used the ##3282# then edit, then restore, and it re-provisioned the phone. This will require your MSL.
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