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switch off your blackberry, remove the back cover and battery, and remove the sim card. Replace it after about one minute and it should not read SOS anymore. If it still reads SOS, insert your sim card into another cellphone to see if it also reads SOS in a different phone. If it does, you need to call the company you bought the sim card from. Eg; if it's an MTN sim card, call MTN; if it's Vodacom, call Vodacom etc.
Have you tried using it in another device that reads/writes SD cards? It's possible it is a counterfeit SD card. Some counterfeit cards don't work or are not the true capacity. If it it a name brand like SanDisk it will have a serial number. The counterfeit ones typically don't have serial numbers.