What location information is available generally for Mobile apps?

Hello All,

I'm thinking through an idea that would heavily rely on the usage of a users current location. It would be from the context of a mobile application.

I know many people are okay with sharing their location if they see a legitimate purpose for it. I myself block request for my location unless there is a clear value to me.

My question is this: What are the methods for collecting and verifying a users location from a mobile application(ios/android)?

Methods I'm aware of:

• General location lookup by IP.
• GPS location provided by the os with user consent.
• Metadata on photos and maybe other media?

Verifying? I'm not sure how you would verify that the location is not spoofed in some way. IP and metadata seems like they would easily faked.

I'm looking for resources on collecting and verifying user location data. If anyone has good resources to share would be appreciated!