Even with that stupid 1111 password, whilst it is pretty easy to work this out, it would still take a fair bit of time/frustration for this thief to work it out. Keep trying that "find my phone" as I suspect it hasn't turned on since you lost it or not connected to network. Or maybe it just "lost down the couch" sort of thing and may still be at the same place as you lost it. Use that find my phone to track its last known location and may be worth rooting around for it. If definitely got it nicked, then like Lee Power says, report it to your network operator.