Phone App technology - is this available?

[bringbackmols]

Hi guys,

Listen, I am not greatly versed in the world of technology or its lingo, so apologies if I am not up to scratch, hope you guys can help, its appreciated.

I am wondering this:

Is there technology available that will allow one mobile phone app in close proximity to the same app on another phone, to send a notification to that app if it fits certain criteria - WITHOUT the need for the app user to have to manually initiate a search of any sort, therefore it would just recognise this info automatically within a certain distance?

Am I right in suggesting that would require some form of Push technology aswell as GPS technology?

Anyway hope you guys can help.

Thanks.

[carnageX]

IMO, that could be a huge risk of security / privacy. I wouldn't want people to know where I am without my knowledge.

[KSoD]

Not to mention the fact this type of app would be a battery killer! You would be lucky if 3 people would have that installed and running at all times, that is if any app store would even allow it cause of the security risks.