I had an idea for a similar app, perhaps you can incorporate my idea into yours. My idea was when you write down their name, it also saves the available wifi ma

I had an idea for a similar app, perhaps you can incorporate my idea into yours. My idea was when you write down their name, it also saves the available wifi mac addresses it sees in the vicinity. Then when you see someone again somewhere else you can look at the app for names that might be them (based on the visibility of wifi mac addresses). The theory is that people carry a phone on them that is unique and is often in wifi mode trying to make a connection which broadcasts the mac. So when you record a contact, one of the visible mac address might be them. In a new place it sees what mac addresses are around and loads up your contact list based on what addresses were visible at the time.