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Wannabe Geek


# 79788 22-Mar-2011 15:03
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Occasionally, I found that my Vodafone 845 would randomly call people when it was in my pocket. This morning, after it called a friend 10 times in a few minutes, I spent some time to work out what was going on. This article describes my findings:
 
The following features of the phone contribute to the problem:
 
When the phone has not been used for a while, the screen goes blank and the phone locks. In order to unlock the phone, you press either the 'Power' button or the 'Menu' button to bring up the phone unlock screen.

From the phone unlock screen, you slide the green slider from left to right to unlock the phone (much like the iPhone). However, there is a bug (or mis-feature) on this screen. If you press the 'Menu' button, the phone also unlocks.

When the phone is unlocked, you get to the Home screen.
 
When you press the 'Call' button from the Home screen, it brings up the call log. When the call log is active, pressing the 'Call' button dials the most recent entry in the call log. This is meant to make it easy to return a missed call, or redial the person you last spoke to.


When the phone is in my pocket, something presses buttons: wallet, keys, buldging thighs, etc.


The 'Call' and 'Menu' buttons are right next to each other. So it is conceivable that they get pressed in a random order.
 
The sequence is to make unwanted calls is:
 
1. The phone is in my pocket with the screen blank and the phone locked.
 
2. Something presses buttons randomly.
 
3. Pressing 'Menu' brings up the unlock screen.
 
4. Pressing 'Menu' unlocks the phone -- this is a bug.
 
5. Pressing 'Call' brings up the call log.
 
6. Pressing 'Call' redials the most recent entry in the call log.
 
7. After the called party hangs up in disgust, the phone returns to the call log screen, ready to make more calls from step 6.
 
8. It takes a while for the phone to time out and lock itself again. Even when it does lock, it can still make unwanted calls from step 2.
 
Workarounds
 
One work-around is to keep the call log empty. However, if I miss a call, it gets added to the call log, so it is hard to ensure that the call log is always empty.
 
I have instead enabled a different phone unlock option. Instead of having an iPhone-like swipe-to-unlock, the alternative unlock screen requires you to draw a pattern. It is a bit more difficult to use, but does not unlock if you press the 'Menu' button.

I prefer the swipe-to-unlock unlocker> Is is possible to install another phone unlock screen?

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693 posts

Ultimate Geek


  # 450781 22-Mar-2011 15:29
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I have a rooted phone and have the following settings active
"Menu Button Unlock"
"Trackball Unlock"
"Disable Slider Unlock"

I don't have a "Call" button as such and have never arse-dialled.

Sounds like you have something enabling the menu button when by default it shouldn't be.
Is your phone rooted by any chance?

DLS

39 posts

Geek


  # 451145 23-Mar-2011 15:16
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I have a rooted 845, not sure what the button settings are.  Pressing Menu when locked does not unlock it though.  But twice now I have made a call to a contact while it was in my pocket. 

 
 
 
 


924 posts

Ultimate Geek
Inactive user


  # 451371 24-Mar-2011 10:59
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Would the app Call confirm be useful to you?

39 posts

Geek


  # 451374 24-Mar-2011 11:05
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I presume this asks you to confirm before making the call? Yes that would be useful for me as I hardly ever make a call.

924 posts

Ultimate Geek
Inactive user


  # 451379 24-Mar-2011 11:11
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Yep pops up with yes/no when you hit the dial button.
Should be standard on touch screen phones!
When I first got my desire I kept ringing people as I was learning what everything did!

1038 posts

Uber Geek


  # 451380 24-Mar-2011 11:12
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RoyalWulf: I presume this asks you to confirm before making the call? Yes that would be useful for me as I hardly ever make a call.


Ha ha, that's quite funny. You hardly ever make calls on your phone, kind of underlines the fact that their a different beast now huh?! 

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