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Originally Posted by Effendi
Officially you should make a call/SMS/data every 3 months (not 1 month) or your card would be "frozen". In many cases it doesn't happen, but it's better maybe to make just a very little data connection, paying a couple of cents, to keep it active for sure. Just remember to refill it at least once every 11 months (plus 1 month of "grace period").
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I make a GRPS connection of about 1KB. It costs a couple of cents. That seem to be enough.