Question about Sony Ericsson K750i Cellular Phone

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K750i "Insert SIM"

I switched my phone off one night and the next morning when i switched it on appear message "Insert SIM". I have cleaned the contacts both phone and SIM. Tried many SIMs. Nothing works. Please help.

Posted by Sven Katkosilt on


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Do all the contact pins on the phone reach the simcard?
you can try to pull them up a little bit carefully.

Posted on Apr 05, 2008



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Posted on Dec 02, 2010


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Why is my phone giving me a message: No sim inserted or why is my Samsung S5 2017 model requesting that I insert a pin to unlock my sim card if I have not switched off my phone.

Have you tired removing the sim card, giving the contacts a clean and putting it back in. Sometimes they will be dirty and make intermittent contact. If you want to clean the contacts, remove the sim and CAREFULLY clean the contacts with alcohol or methylated spirits. See if that works.

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hi,try put that sim in another phone..try see if you will still get the same message...if you get the same message, it means the sim card is bad...but if you do not get the same message you could look for a clean matterial to clean the place you normally place your sim on the phone..if this does not work also, the you will have to go see an expert to help you handle it.

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If i turned on my chinaphone n95 it says "insert sim". though i tried to change another sim card but still the same display "insert sim" and i cant start using my phone. how to fix it

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Check The sim Holder First then Clean It after that If The Problem Occured Then Use another Sim If The Problem Solve then Replace Ur Sim From its Operator If Problem Not Solved then First Update the Phone Software and also Problem occured then Repair ur sim Holder From Motorola Service Cemtre........................

Good Luck.............

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you need to reflash the phone's firmware this can be done online at or take it to a mobile service center and have it done there

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This problem is due to your phone's sim card IC malfunctioning. It may get damaged due to phone dropping gently into rough surface and its crystal structure may break due to it. for any queries mail to [email protected]

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