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Level 8

36,277 points

So why does my iPhone vibrate twice at boot?

My wife and I both have 16G iPhones, but for some reason when mine boots from power off, upon joining the AT&T network it vibrates twice in quick succession while hers does not.

No difference in any settings I saw right off hand.

Anyone know why?

Quad 2.5 GHz G5, 5 GB | 2.33 GHz MBP C2D 2 GB, Mac OS X (10.5.2)

Posted on Mar 20, 2008 3:33 AM

Best reply

GameraFan

Level 1

10 points

Posted on Mar 20, 2008 8:15 AM

Just a thought: Is your phone in silent-mode (switch on side of phone) while hers is not?

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21 replies

MRCUR

Level 2

426 points

Mar 21, 2008 2:58 PM in response to Nathan C

Nathan,

No, the phone does not vibrate on normal boot.

The phone does not vibrate when I connect it to the power adapter if it is already on and set to ringer mode. If it is set to vibrate and powered on, yes, it is the same vibration.

-MRCUR

Dogcow-Moof Author

Level 8

36,277 points

Mar 22, 2008 11:36 PM in response to MRCUR

I've noticed it when it boots from being plugged in.

I haven't noticed it on a normal boot; perhaps that's it - it vibrates twice for a power adapter boot when the battery is lower than full charge?

I did a "power adapter boot" of my wife's phone when it was fully charged and it did not vibrate twice.

m8an

Level 2

260 points

Mar 23, 2008 2:25 AM in response to Dogcow-Moof

relax guys, this is completly normal behaviour.

your iphone does not vibrate on boot, your iphone just vibrates when you connect it to a power adapter. and if your iphone was turned off and you turn it on while it is connected to the power, it recognizes that connection and therefore vibrates to indicate it. that's all there is to know 🙂

Dogcow-Moof Author

Level 8

36,277 points

Mar 23, 2008 5:30 PM in response to m8an

Reread the post just above your reply.

When I connected my wife's iPhone to the power adapter and booted it, it did not vibrate twice when it came up.

The only difference is that the battery charge on mine was reported as below full, and hers was listed as fully charged, so there's more to it than just connecting the power adapter.

MRCUR

Level 2

426 points

Mar 23, 2008 7:29 PM in response to Dogcow-Moof

I'm not sure that's it. I leave my iPhone charging overnight, so when it boots on the dock (plugged into charger), it is fully charged. And I constantly get two vibrates every morning.

I have a friend staying with me right now and he has a (close to) launch iPhone, and it also vibrates twice on boot. His also vibrates every time no matter if the battery is fully or not fully charged.

Dogcow-Moof Author

Level 8

36,277 points

Mar 23, 2008 9:36 PM in response to MRCUR

The mystery continues; these are both 16 GB iPhones purchased at the same time from the same Apple Store a few days after launch; their serial numbers are only a few apart.

So why does my iPhone vibrate twice at boot?