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How to ensure SIM won't be blocked soon?

#1
How do I check that a SIM card is officially registered and won’t be blocked within a week?
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#2
Try contacting the operator to confirm its status, if possible without breaching personal data.
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#3
Look at the seller’s reputation. If all their cards die after a month, it’s a shady scheme.
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#4
Ask for a small “test”—use the card for about a week. If all goes well, then pay the remainder.
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