I was using a Galaxy S5 and didn't have any issues with the follow me Mode, I've since upgraded to an S7 and have access to an S8 active, however I haven't used the follow me mode on either of these. If I get a break from the rain in this neck of the woods I'm going to have to try the follow me mode (gps) to see if I come across any issues. I also have a Tab S3 to try too.
I don't have access to my drone right now but I just opened Solex and the very first thing it did was bring up my location on the GPS map. I would be surprised if it couldn't communicate this information to my solo, but then again, this needs to be tested.
The only problem I ran into with "follow me" was one drone that refused to budge and stayed in the same place. Couldn't figure it out until I realized later that I had set up a Geofence and had selected RTL (return to launch) instead of RTM (return to me). So as I moved off, I exited the Geofence area and the drone could not follow me. I have heard that the RTM option within the 3DR app is not functional.
Another thing you may want to check is your app permissions. Did you give the apps in question permission to access your GPS location?
Looking quickly at the weather forecast, it's possible I may have a chance Sunday to test these devices, I'll keep you posted on the results.
**Addendum**
If I get to test, I'll be testing this on 3 different drones. One using the old version of the MRO GPS. One using the new version of the MRO GPS. One using the HERE GPS.