Q: How do I keep my wifi Hotspot active between iPhones?  The connection seems to drop after a few minutes of no activity.

I tried keeping the phone with the hotspot (the 4s) on the hotspot settings view with no screen lock.  The iPhone 6 still disconnected after a few minutes.

I also tried to connect my iPhone 4s (iOS 7.1.2) and iPhone 6 (iOS 8.3) via Bluetooth for a hotspot, but they don't see each other.  Perhaps i need to update the iPhone 4s?

I wanted to be able to keep the connection live while I traveled abroad.  Very inconvenient to have to keep connecting them.

Thanks in advance,

-Marc