![]() This is very common with Samsung phones, as it prevents their smartphones from being bought at a discount in a third-world country, and sold for exorbitant prices in a rich country. Some smartphone manufacturers add a region lock. The solution? Go out and buy a new SIM card that fits your needs. For postpaid SIM cards, if you don’t sign a new contract after the old one expires, the SIM card is disabled. There is no universal time period, it’s usually anywhere between 3 and 6 months of balance inactivity. If you stop topping up the credits, the SIM card is disabled by the carrier automatically. ![]() People often forget that there’s a time limit, especially if they’re using a prepaid SIM card or a pay as you go SIM card. Update your firmware or operating systemįrom our experience, this is the most common reason for the “Invalid SIM card” issue.
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