Q. Can one program his cell phone to vibrate or turn on its light for a short time in order to wake him up on Shabbat morning?
A. Horav Shlomo Miller’s Shlit’a opinion is that if the cell phone is not placed next to him and there is no likelihood that he may without thinking turn it off before he becomes wide awake, it is permitted.
The Rov recommended to acquire the kosher Shabbos alarm clock.
Rabbi A Bartfeld as revised by Horav Shlomo Miller, Horav Dovid Pam and Horav Aharon Miller Shlit’a