Hey /g/, a friend of mine recently lost his phone. You had to

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Hey /g/, a friend of mine recently lost his phone. You had to type in a few numbers if you wanted to access the mode (no idea what this is called, front screen lock?). It was a windows phone. Now, someone has her phone and sometimes logs on Whatsapp etc. Doesn't respond to calls or messages or whatever so it's obviously not a friend of hers. He receives all messages sent via Whatsapp pretty much always so he has a stable internet connection.

Is there any way to tell where her phone is or who has it?