Fixed it i found this post that solved all the issues. My blue tooth in my truck and using siri lift to talk dont play well togather. Read below. Thanks everyone for your time..
Re: My iPhone 5 proximity sensor doesn't work. There is no screen cover or case on the phone. Any suggestions?
Sep 23, 2012 7:49 AM (in response to jefffromaltoona)
I had the same problem (iPhone 5), but the fix was simple.
Turn off your Bluetooth. Yeah, I know this sounds crazy. Here's why.
When you use Siri with the "Raise to Speak" feature activated (Settings/General/Siri), this enables the proximity sensor that lets the iPhone know it is near your ear, activates Siri, and turns off the display.
However, if you are using a bluetooth headset (like I do), then this sensor is turned off automatically, because you will be speaking thru your bluetooth and not the iPhone to activate Siri and make calls.
To prove this, do the following test.
Make sure "Siri" is on, and "Raise to Speak" is on (Settings/General/Siri).
Turn off your Bluetooth (Settings/Bluetooth).
(TEST) Hold your phone in front of you, and with a natural motion, bring the phone to your ear (as if you are answering a call). Siri will automatically activate, assuming you want to ask it/her a question (very cool feature). And the screen will turn offautomatically.
If you have never used the "Raise to Speak" feature, this feature automatically activates Siri when you raise the phone to your ear (really a cool and helpful feature). It may take a little practice to get used to this. I struggled at first, but soon got the hang of using a natural motion to bring the phone to my ear. Starting with the phone in front of you, the phone should be "almost" parallel to the ground when it gets to your ear. It may take several practice tries to get it, but you will get it, and you will be hooked on this neat little feature.
Ok, with this done, this proves your proximity sensor is funtioning properly.
Now, turn on your Bluetooth (Settings/Bluetooth).
And repeat the same (TEST) above.
This time, Siri should not activate, and the screen should not go off. Why? This is because your voice communications with callers (and Siri), are now going thru your Bluetooth, and not the phone handset. Because of this, their is no need for the proximity sensor, so it is automatically turned off (when Bluetooth is on).
I can only speak for me and my situation, and what worked for me. However, their may be other issues regarding the proximity sensor separate of this that I am not aware of.
By the way, I am using the "Otter Box" with the built in screen protector, and it all works fine.