SIM Card Not Detected: How We Fix This

Your phone shows "No SIM" or "SIM not inserted" even though the SIM card is clearly in the tray. This fault prevents all calls, SMS, and mobile data. At Pro-Logic Technologies, SIM detection failures are a common and usually very fixable fault. Causes of SIM Not Detected Incorrectly seated SIM card — the SIM is not sitting…

Your phone shows "No SIM" or "SIM not inserted" even though the SIM card is clearly in the tray. This fault prevents all calls, SMS, and mobile data. At Pro-Logic Technologies, SIM detection failures are a common and usually very fixable fault.

Causes of SIM Not Detected

• Incorrectly seated SIM card — the SIM is not sitting perfectly flat in the tray, causing poor contact with the SIM reader.
• Damaged SIM card — SIM cards are durable but can fail from age, bending, or exposure to static electricity. A damaged SIM will not be detected.
• Dirty SIM contacts — oxidation and debris on the SIM card's gold contacts or the phone's SIM reader contacts causes detection failure.
• Damaged SIM tray — a bent or damaged SIM tray can prevent the SIM from making reliable contact with the reader.
• SIM reader fault — the SIM card reader on the motherboard can develop physical faults — bent pins, broken contacts, or damage from liquid exposure.
• Baseband software fault — in rare cases, software prevents the SIM from being recognised at a firmware level.

Step 1: SIM Reseating and Cleaning

We remove the SIM card, inspect it visually, clean the gold contacts gently, and reseat it carefully in the tray. We also clean the SIM tray contacts inside the phone. This simple step resolves a large proportion of SIM detection issues.

Step 2: SIM Card Test

We test your SIM in a known-good device and test a known-good SIM in your phone. This isolates whether the fault is in the SIM card or the phone's reader. If your SIM works in another phone, the fault is in your phone's reader.

Step 3: SIM Tray Replacement

A damaged or bent SIM tray is replaced with a correctly matched tray for your phone model.

Step 4: SIM Reader Repair

A damaged SIM reader on the motherboard is repaired through micro-soldering. Bent pins are carefully straightened or the reader component is replaced.

Step 5: Firmware Check

If hardware is intact, we check for baseband firmware issues and perform modem repair where necessary.

No SIM means no phone service at all. Visit Pro-Logic Technologies and we will restore full connectivity.

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