Well, what happened was that the people she's travelling with rented a phone from Verizon. (We investigated a rental, but at $30/week it didn't seem worthwhile for what we needed it for.) Cost: Outgoing calls to the US, $1.60. Incoming calls, free. So she borrows their phone, calls us, hangs up before we answer, we see the caller ID, and call her back on the Philadelphia-area mobile number (which forwards to the one in the UK).
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