I forgot to timely replenish my sim card a few years ago. I do that by adding a dollar to the card from money prepaid on my Chippie account and that extends it about 60 days. The Chippie website indicated that it had expired because I hadn't replenished it. I went ahead and added a dollar to the card and that reinstated it. Since then I have forgotten to add the dollar prior to expiration a few times but it has always allowed me to add the dollar after it expired and the expiration status went away. I would try that before buying a new sim card.
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