cannot verify server identity

Honeywash wrote:

I think someone was trying to sync information from my iphone to their device.

No. That's backwards.

Your phone is attempting to sync contacts with Yahoo and can't.

Honeywash wrote:

Cannot Verify Server Identity

The identity of "carddav.address.yahoo.com" cannot be verified.

I keep getting this message on my phone. I googled it and After reading the description, I think someone was trying to sync information from my iphone to their device. Any thoughts what this could mean ?

Start by contacting yahoo support.