First thing you need to do is make sure that just dust or rust is not causing this issue clean the Microsoft Lumia 550 SIM card connector and check if all the legs are in good shape, if there is any kind of damage to the SIM Card connector replace it with a new one.
The solution below provides and shows the Sim card circuit connection of the Microsoft Lumia 550 phone and quickly tells us which particular or certain components needs to check during troubleshooting procedures.
This solution may possibly help fix and repair a damaged Microsoft Lumia 550that result to Insert Sim card problem issues. If the mobile handset device does not accept any kind of sim card and only shows insert sim card in the LCD screen display, you may refer to this solution below to trace and check certain components that might get damaged and result to insert sim card problem.
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Microsoft Lumia 550 Insert Sim IC Solution Jumper Problem Ways Sim Not Working Sim Not Valid