Stolen iPhone: what is the security risk?
Actually, the data on your iPhone 6 is encrypted at rest and furthermore no data comes off the device even if it is connected to a computer. Someone would need to brute force the PIN and then press Trust to trust a computer which would then be able to transfer off data or sync the device.

It's suspicious you got password resets. Perhaps the lock screen was configured to allow them to reply to messages or dial phone numbers or otherwise look at incoming mail. That would of course mean that the phone had WiFi or data connection - so in that case, the remote wipe is a good possibility.

I hope you get a response to the wipe, but you are in a fairly good situation all things considered.

Here are Apple's documents on how data is protected and what to do in the case your device is lost or stolen:


https://support.apple.com/en-us/HT202775
https://support.apple.com/en-us/HT201472