Iphone 4 Proximity Sensor Problems

proximity sensor
An electronic device that detects and signals the presence of a selected object. When used in association with a radio frequency identification system the sensor is set up to sense the presence of a tagged or transponder carrying object when it enters the vicinity of the reader/interrogator so
A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact.
A non-contact sensing device used to sense when objects are a short distance away, and determine the distance of the object. Several types include: radio frequency, magnetic bridge, ultrasonic, and photoelectric.

iphone 4
The iPhone 4 is a slate smartphone designed and developed by Apple. It is the fourth generation of iPhone, and successor to the iPhone 3GS.

problems
A matter or situation regarded as unwelcome or harmful and needing to be dealt with and overcome
A thing that is difficult to achieve or accomplish
(problem) a state of difficulty that needs to be resolved; "she and her husband are having problems"; "it is always a job to contact him"; "urban problems such as traffic congestion and smog"
(problem) a question raised for consideration or solution; "our homework consisted of ten problems to solve"
(problem) trouble: a source of difficulty; "one trouble after another delayed the job"; "what's the problem?"
An inquiry starting from given conditions to investigate or demonstrate a fact, result, or law