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Episode 105: Telephony

Android Developers Backstage

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How Does Roaming Relate to All This?

The carriers have a pre-negotiated agreement and so they form roaming partnerships. Each country has a slightly different set of frequencies that they allow cell operators to run on. They don't know where you are, and so they just start scanning for your home network when you turn the phone off. So then they have a prioritized list of channels to scan.

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