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Coolpad Quattro won't recognise 4G SIM card.

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My husband's Coolpad Quattro won't recognise SIM card.

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If you inserted another SIM card from a different network, it's most likely it won't work since the phone could possibly be locked to the one network only. For unlocking you need to pay a small amount from the carrier's service. Other than that, since it's an Android-based phone, please go to Settings > Wireless and networks > Mobile Network and perform a scan and choose the right network where the SIM card belongs to.

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