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O2 I've answered them all and they all cut off after about 30 seconds connected. It doesn't sound like there's a person at the other end. Its from different numbers each time. I've had 4 in the last 2 days - all from 07956 (then different). Mixed times of day too.
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O2 To confirm too - I've called these numbers back and there's always a human at the other end, and it's not a call centre from what I've gathered.