iPhone 3G: How To Reduce Dropped Calls
If you are experiencing dropped calls on your iPhone after updating to latest 3.0 including baseband update then you are not alone. Although Apple and AT&T have been improving the services, dropped calls are still a reality.
The following steps may help to reduce dropped calls
1) Use Field Test mode present in the iPhone to determine the signal reception levels: To determine this, activate the Phone application, bring up the keypad, type in *3001#12345#* and press the Call button. This brings up the Field Test main menu. Note that you should see the signal strength bars in the upper left corner of the screen replaced with a number indicating the strength of the signal in decibels. The signal strength is indicated as a negative number, and the lower the number, the better. For example, the -75 shown is better than a -99. A signal strength between -60 and -80 is considered as good reception.
You can use this feature to determine where the best reception is at any location. If you’re having problems with dropped calls, favor those locations.
2) Turn off 3G to improve phone performance: Turning off the 3G in an area with poor reception always helps in getting better reception. Better keep 3G turned off most of the time and turn it on only when you intend to browse the Web or download an app from the iTunes App Store.
3) Use wired headset: Using a wired headset can improve signal strength as the cable coming from the headset also acts as an extension to the internal antenna.
4) Hold your iPhone at top: The antennas for the iPhone are located in the bottom of the device. If you wrap your hand around the lower part of the phone, you can degrade the signal slightly. Holding iPhone near or at the top can make a huge difference at places with weak signal strength.