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Solution
Well you may want to first try getting a new SIM from the carrier/service provider and see if the SIM you have is the issue. Not all SIMs work for all devices. However a SIM is for service, and usually inserted while the device is off. While SD cards can usually be inserted while the device is on.

If getting a new SIM from the carrier/service provider doesn't resolve it, then there may be a problem with that port on the phone.
Well you may want to first try getting a new SIM from the carrier/service provider and see if the SIM you have is the issue. Not all SIMs work for all devices. However a SIM is for service, and usually inserted while the device is off. While SD cards can usually be inserted while the device is on.

If getting a new SIM from the carrier/service provider doesn't resolve it, then there may be a problem with that port on the phone.
 
Solution