Press the PS button and share button on the controller. It puts it in pairing mode
I tried that several times on several devices, never could get it to work... I'm planning on using a wired OTG connection anyway, BT is too unreliable, and my T1s will be here Tuesday afternoon ... so I didn't waste much time on this PS4 controller - with the aTello app and aTelloPilot, the sticks work and that's what I was looking for, for now.