Can Bluetooth 4.2 connect to Bluetooth 5.0?

I'm planning to buy the next generation of Apple Watch when it's released (September), because it's most likely going to come with Bluetooth 5.0. However I have an iPhone 7 Plus right now which has Bluetooth 4.2 . So will I still be able to pair up the devices?

I don't know ask Siri

The BT protocol is backwards compatible, there may be features not available with a mix.
Could loose some functionality the watch provides but the phone doesn't support.
Look into upgade for the phone.

When you have two Bluetooth devices of differing versions they will operate together at the lower version of the standard. In your case, it would mean that they would talk to each other according to the standard for Bluetooth 4.2. As Bluetooth is simply a communications tech all it means is that the comms between the phone and the watch would be somewhat slower (but still damn quick), and the range would be less - that's all!

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