How can I protect the information in my stolen iPhone?

Hello device195!

If you’ve followed the steps within the following Support Article, then you have nothing to be worried of: If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support.

Beware! The thief may try to send you messages claiming to be Apple, asking for your Apple ID, passcode, etc. DO NOT provide any such information to anyone or anything.

The fact is, you will probably never see the device again.

Have a nice day, and good luck!

Your data is protected assuming that you were using a passcode on the phone. There is no way that a thief or anyone else could guess your passcode in a very limited number of tries.