Need Ideas on how to verify a location through mobile

We are building a mobile application where the user uses a mobile application to send a message to the assistant that wants his help. The user should be able to see on the sticker his position and then after entering it, it press the button to "Get Assistance". Now what we want to prevent is a user going home, open the application, then  enter the position again and press the button "Get Assistance".  This is going to be a multi location application and we can not put too many constraints. We need an idea that is practical.

THANKS
spiral2007Asked:
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_Commented:
hmmmm... would something like --
have the app check if there is a "Get Assist" is already 'active'.
If yes, then a message to "Cancel or Continue" the current "Get Assist", comes up.
If no, then it sends the "Get Assist".

This will probably only allow 1 "GA" at a time.
If you need more, have it check for a call to the same person, or for active and the same person.
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_Commented:
Thank you much.    : )
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