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(#1)
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Senior Member
Prepaid Expert
Posts: 322
Join Date: 11 Apr 2012
Location: London
Country:
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![]() With UK SIM cards, usually any balance deduction is sufficient. While outside the UK, the cheapest balance deduction is probably an outgoing text or a brief incoming call (provided that incoming roaming calls are billed per second). I have a spare Three UK SIM card with zero credit on it, and in practice I keep it active with an incoming call (obviously free within the UK) every six months, for which Three receives a small amount of termination fees; however, this last method is not their official policy.
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