Can I turn off a co-worker's cell phone?

The woman I sit next too (we share a cubicle wall) just left for lunch. Apparently she left her cell phone here, and it keeps beeping and vibrating every 2 minutes. Would it be ok if I went over to her desk and just hit a button to make it stop beeping? FYI...this woman and I don't necessarily get along....
Update: Ok, you guys are all right. I won't touch it.
Thanks!
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