LINE APP question, how to check who has your number?

[newsmartphoner]

I would like to know how to check in LINE who has my number? I can obviously see on my list what numbes I have, but I want to know who has my phone number on their phone, and I know LINE can show this, at least for Iphone it can.. help!

 

[dvhttn]

Umm, I would say that that was impossible. There may be some way you could find out that someone had your number in their Google contacts, though that, IMHO, would be a security issue at Google, but you would never be able to find out if I had your number on my phone because all my contacts are local to my phone/PC. And how about those who just add your number directly to their phone and don't sync with the cloud? How about people you've called who have your phone number in their call log?

Dave

 

[Hadron]

I think that LINE is an internet calling app, so I could imagine that it can show you which other LINE users have your LINE number if it maintains a database centrally.

I guess that something that was sufficiently intrusive and had phonebook access permissions could slurp up the contacts of everyone who loads it, then cross-correlate them on a server, but if so they'd be very foolish to advertise the fact. I'm not a lawyer, but even if it isn't illegal it would surely get them into trouble. And they still would only have the info for people who installed that app.

As Dave says, clearly no app can show you everyone who has your phone number in their normal phonebook. Even the NSA/GCHQ can't trawl stuff that isn't uploaded anywhere, and for a normal app dev to have access to everyone's GMail/iCloud/etc accounts would be a truly scandalous security failure.