Jailbroken iOS 9.0.2 on iPhone 6s pairing with Apple Watch 2.2
The minimum of iOS is for watchOS 1 as the software on the watch updates so will the phones I had the same issue and it came down to;
Upgrade the phone, gain features on the watch but loose some on the phone

Don't upgrade the watch, miss out on exciting new features but keep my phone jail broken...
I upgraded and am now waiting till the 9.3 jailbreak is released