Hi,
I want to travel, should I buy a swim suit?
It depends.
A "car tracker" does not describe what data you want to transfer.
One direction, both? to a database(cloud) or to a browser? Or peer to peer? Over-the-air updates of a microcontroller.
How often per day / per second. Packet sizes. peak data tranfer rate..
Which protocols, which mobile phone technology (may depend on countries) ..
Size, current consumption, power saving modes...
Your IDE / compiler / language, available software / libraries ...
Klaus