Once your probation is terminated, it's over and done. It cannot be reinstated. So congratulations on your timing. As for the point value of a cell phone ticket, I don't know the answer off the top my head. I'm sure one of my colleagues here on AVVO will answer shortly.
If you have completed probation you cannot be violated, for any new offense. My experience had been am infraction would not generate a probation violation anyway. If you were cited for a violation of VC23123 does not carry any points unless the law has changed recently.
Once probation is terminated then the court has no jurisdiction over the case. It's over and no longer an issue.
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If, as you described, your probation is over. Regardless, it wouldn't have been violated by the infraction even if your probation was still active. Best of luck.
If your DUI probation was already terminated pursuant to 1203.3, a new offense of any type cannot violate an already terminated probation because the San Mateo County Court no longer has any jurisdiction on you. I do want to point out here that even if your probation had not been terminated, an infraction will not generally violate a type of informal or formal probation. Additionally, if you are convicted of cell phone use infraction, it will not add any points to your license. You will have to pay a fine if you plead quilty or no contest to this infraction.
Notwithstanding any language to the contrary, nothing contained in this answer constitutes legal advice, nor does it create an attorney-client relationship.