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This question already has an answer here:

If a alarm is set and a Android device gets turned off (for whatever reason), does the alarm still sound?

I want to generically refer to Android (latest version if it makes any difference) and we are talking about stock Android

marked as duplicate by Izzy, bmdixon, eldarerathis Mar 7 '15 at 21:38

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It depends on the phone and on the alarm app. Some offer this specific function in case your phone does not wake automatically. Some other offer a scheduled wake to turn your phone on just before your alarm has to ring.

Anyway, if you put your phone into airplane mode, it is much like turning it off: provided background apps are closed, all your phone is gonna do is wait for the alarm to ring. It will not send or receive data (for those who don't like waves near them all night when they sleep), and it is gonna leave your battery level near untouched.

  • Stock Android, latest version. True turn off, no sleep or anything else. – riahc3 Mar 7 '15 at 15:42
  • I said it depended on the phone, not on the ROM. Do you mean stock Android's alarm app? Also, I never said anything about sleep, I just mentioned airplane mode as an alternative to turning your phone off during the night. If you want to know in case of an accidental turn off, the first paragraph is my answer. – Jeffrey Lebowski Mar 7 '15 at 15:44
  • How can it depend on the physical phone? It has to be a software feature. This is a question, not geared towards alternative answers. – riahc3 Mar 7 '15 at 15:46

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