Most modern mobile phones such as Android smartphones and iPhones have to make use of GPS signals. It is a basic feature of all new phones and most of them use GPS technologies to offer services. Without GPS, most mobile phones will not be able make use of modern technology. GPS is only necessary for a few services. A mobile phone might make use of mobile internet to perform most of its services as well, but there are important services that operate exclusively on GPS systems.
While purchasing a phone, you should check whether it has GPS built in. If you have no idea about GPS systems, then continue reading.

A few things to know about GPS signals
GPS stands for Global Positioning System and requires a satellite to transmit signals. The signals are usually in microwave form and can be received by any device which is equipped with a GPS receiver. GPS receivers also have the capability to send GPS signals back to the satellite from which they got them, so transmission of data can take place this way. Mobile GPS receivers are not that powerful and can receive GPS signals from towers or base stations.

Why do you even need GPS signals?
It is evident by the name, as GPS signals are used to locate a receiver. Ever heard of Satellite navigation systems? Most mobile phones have a sort of Satellite navigation system service now. If you are lost and have an Android phone, you can use Google Maps to find your current location. This is possible due to GPS systems, as your mobile needs to transmit its location to any nearby GPS tower to give it its location. With your location given, you will appear on the Google Map and you can find your way to your destination.
GPS signals can also be used for phone number tracking. You can use software that makes use of GPS signals to find location. You can use trackers to keep a check on your children and find out where they go. The government uses the same method to track down wanted criminals or stop a crime from happening by apprehending suspects before it takes place.