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Walkie-talkie radios differ from pagers in several relevant ways here. First, they're larger, and so have room to hide more explosive material; some of the images I've seen show damaged buildings, suggesting larger explosions than we saw with the pagers.

Second, walkie-talkies aren't generally carried around all the time the way pagers are. They typically spend a lot of time off and sitting in a charger, possibly near other radios. This is also consistent with the images of damaged buildings.