Apparently all phones send or receive GPS signals in whatever location one is. Whether the phone is on or off it can send GPS signals. What happens is that two ways radio transmitters connect to a nearby tower and they exchange data. The ability to connect to miles away at UHF frequencies enables and produces enough power which supplies, the replacement of flashing antennas with energy.It means that the actual data is sent from anywhere around the globe.
Lately it has been very easy to transfer information via the satellite; the phones can pinpoint allocation pick information and provide the necessary data of that particular individual. Cell phones send and receive signals, and with the right software’s they are able to pinpoint and give directions to destinations, they even provide information about nearby businesses.
As one travels they move from one location to another, with the Global position system as it send and receives the data from location to location the signal diminishes from your previous location but as you move to a new location the base signal picks up the satellite from this location thus it is very easy to trace someone wherever they are.as you move from location to location and cell to cell the towers transfer signals from one to the other.
Gps signal is transmitted in remote areas, but sometimes due to mountains, tall buildings signals can be interrupted, this is inclusive of buildings sometimes it is difficult to transmit the signals without GPS receivers computer can also determine your location based on the approach of the angle of the cell towers, the multiple towers and the time taken for the signal to travel and also the strength signal of your position to reach the tower.
Yes indeed all phones send and receive GPS, making it very easy to know the location of your phone maybe it is lost or stolen. The tracking helps with investigations too so definitely this answers your questions on sending of GPS signals around the globe.