IPhone 4 locking up during a call

I have had a problem with my iPhone 4 locking up during a call. Typically I'm bored when talking to some people. I'll put it on speaker and then browse the internet. Often, but not always, the phone remains locked on the phone screen and I can't get the home screen or do really ANYTHING. For example, I was talking to someone and needed to go to my calendar to schedule something. It would not let me leave the phone screen.
Also I often will end a call or have the call end and the phone screen remains in the foreground offering me the red bar at the bottom to end the call until I click on the home screen.
Anyone else have this problem? Is there a fix?

I just received my iphone 4 yesterday. I had the same problem. I upgrade the os to 4.02 and still the same problem. I read some of the posts and decided to test the theory about the proximity sensor. I have a griffin case on my phone. When the phone is in the case, the proximity sensor doesn't function correctly and it locks up. When its out of the case it works just like it should. I called myself on my office phone and moved the phone back and forth from my face. Once the screen blanks when the phone is in the case, the only way to get it to unlock is to pull it out of the case. But if I use the phone without the case, I have no problem at all it works flawlessly. It blanks when I put it near my face and immediately unlocks when I take it away. I hope the free case from apple will solve this problem because I am paranoid that I will drop my phone without the case and destroy it.

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My iPhone keeps disconnecting during a phone call

Basics from the manual are restart, reset, restore
Follow the 3R's- if a restart does not solve your problem proceed
User troubleshooting is:
1.restart, ie power off/on,
2. reset http://support.apple.com/kb/HT1430,
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See previous post that is marked as solved, but is not solved in my case.
I am using Mail for Exchange, my company forces the phone to lock after 10 minutes of idle time.
When I get a phonecall when the phone is locked, there is no way that you can have access tto normal phonecall functions as <Mute> and <Speaker> during a phonecall. And you can not unlock without breaking the call..
Yes when you receive a call ther is a green <answer> and a blue <unlock> slider. Howvever when swipng the <unlock> you can only choose between <answer> and <reject> and there is [Option] that gives you access to <answer> or <reject> aswell.
In other words no access to phone functions, No way you can activate the speaker on the phone when you were called while the phone was locked. This is quite useless and in my opinion a design flaw.
NOKIA HELP ---- NOKIA HELP ----- NOKIA HELP ----- NOKIA HELP ----- NOKIA HELP ----- NOKIA HELP ----- NOKIA HELP ----- NOKIA HELP ----- NOKIA HELP ----- NOKIA HELP ----- NOKIA HELP ----- NOKIA HELP ----- NOKIA HELP ----- NOKIA HELP ----- NOKIA HELP ----
.NOKIA HELP ----

whats stupid that your company has locked the phone in some way?
back up your data and reformatt the phone if you wish this should remove the lock (where ever they got it from we would like to know)
this will take your phone back to out of box condition
try these code below
. *#7780# - Restore factory settings - resets all the settings to the default ( you will not lose any data)
Make sure you back up your data as you will lose all of it when you perform option 2 or 3 on this list. The default code for all operations listed here is 12345
2. *#7370# - Reformat your phone
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If i have helped at all a click on the white star below would be nice thanks.
Now using the Lumia 1520

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