On every mobile phone, a signal meter indicates the strength of the mobile reception that you are receiving.  There are some factors that contribute to the reduction of the signal strength, which include geographical conditions, problems with the mobile phone, the exact location that the call is being placed from and more.

There are times when your mobile phone may not have the right amount of signal strength, which is typically attributed to damage the device has sustained.  Some of the most common damage that an iPhone can sustain is liquid and accidental damage.  A spilled drink or an accidental drop of the phone can damage important components of the mobile phone causing the reception problems.