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How Global Roaming Actually Works (and What to Buy)
When you land in a foreign country and your phone connects to a local tower, a complex handshake happens in milliseconds between carriers across the SS7 signaling network. In this episode, we explain the engineering behind international roaming — the IMSI, HLR, VLR, and wholesale agreements that make it possible — and then cut through the marketing to evaluate the actual options. From Google Fi to Airalo to Holafly, we break down the economics, the throttles, and the trade-offs. If you've ever wondered whether "global unlimited data" is real or just a promise, this episode has the answer…
The skinny
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