I've built myself a crude EMI probe:
I then pointed it at the top part of my phone when the phone was powered on, and I saw the following waveforms on my scope.
First off, there are spikes every 525ms:
Zooming in on the gap shows the following short-long-short-long-long-long ...thing. Also interesting to note is that the gaps are exactly 3us.
And then if I zoom further in on the rectangular part of the wave, I see the following 13.55MHz sine wave:
What's going on here?