Frequently, when I answer my incoming call on the 7520 (Nextel), the unit disconnects the call. Does anyone else have this problem.

Typical Nextel.....

Only happens to me when i drive around airports and over hills...bad reception...check the reception when it happens....i don't think theres a quick fix for that...unless it could be low battery...just a guess...

You could try to update your raido software. This is done as part of the OS upgrade. To perform the upgrade you will need the blackberry desktop manager software installed on a PC that has an open USB port. For more information and to download the software required, please visit the Nextel Blackberry Solutions website. (Since I haven't made 10 posts yet I can't provide you with the URL here. However, just do a google search for nextel blackberry and click on the first site found.)

Before doing an OS upgrade you might want to do a Master Radio Reset. This is in your security settings, once you are in the "General Settings" portion of the security menu, click in on the scroll wheel and select "master radio reset". When you are prompted with a confirmation message select "yes" to proceed and then when you are prompted for the password enter the number zero six times and press enter.
After you have performed this operation you will need to go back to the home screen and to turn the wireless on.

I had that problem with mine too. I had to send it in and they sent me another one. I haven't had any problems since.

I'm in the twin cities of Minnesota. To perform a master radio reset on our 7520's we use a password of four zeros. Apparently this password is different based on your location. I agree that this is a better first step than upgrading the OS. After a master radio reset I advise removing the battery and reinserting it after 30 seconds or so. If that doesn't resolve it, you could try a hard reset by removing the battery and holding down the power button for 30 seconds then put the battery back in. If these items do not help try the OS upgrade I mentioned earlier.

I've actually noticed anything from four to eight zeros works for the master radio reset, I dont think its a matter of which location the device is in or where the service for the device is based out of. Any even series of zeros up to eight max should work for this purpose.