Unlike many people think it is actually very easy to fix many common problems occurring in iPhone. One of the common problems occurring in iPhone is related to the phone calls. But you can fix this problem from the comfort of your home itself. If this problem persists then bring your iPhone to Apple iPhone Service Center in Chennai to get it fixed. Here are some of the tips to fix this issue.
Open the setting menu Turn off the Airplane mode and check the signal strength. Tap on the on/off button near Airplane mode. Wait until it shows off. Now count the signals from zero to five. This will give you an idea about your signal strength.
If the signal strength is low then step you should try is resetting the network. From the setting menu in the network section, you can find reset network option to reset your network. This will fix your connection problems.