Nothing changes if you actually did some work and had it working with wifi. A GSM mobile hotspot would work just the same. As I recall, you continually failed to describe your project in adequate detail in other threads you have made, so the locations, positions, distances, all relevant details on how you would secure the device are unknown to anyone trying to get an idea of what your project actually needs to do.Maybe if you just continued posting in your old threads, you won't have to reconfuse everyone again.
How are you detecting whether the parking spot is occupied or empty?
What i need to do is to save a boolean variable to a database.
What i need to do is upload data from the sensor to a database, currently i have a local database but i don't know if i will be able to continue to develop with a local environment since i wont be able to make a local area network
what i'm asking is if the gprs shield is able to do the same things the ethernet shield (that i'm currently using) does.