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Your phone displays "No SIM card," "Invalid SIM," or simply shows no network at all despite a SIM being present. This is an alarming message but one that is frequently caused by something as simple as a poorly seated card rather than a damaged phone or SIM.
The Physical Check First
Remove and reseat the SIM card. Eject the SIM tray with the SIM ejector tool (or a straightened paperclip), remove the SIM card, inspect it for damage, and carefully reseat it in the correct orientation. Reinsert the tray flush and fully. This resolves a large proportion of SIM detection failures immediately.
Inspect the SIM for damage. Look at the gold contact area on the SIM. Scratches, corrosion (appearing as dark spots or discolouration on the contacts), or a hairline crack in the SIM body can all cause detection failures. If the SIM looks damaged, visit your carrier's service centre — Safaricom, Airtel, and Telkom all offer SIM replacement for a nominal fee, and your number and data are preserved.
Clean the SIM contacts. Gently wipe the gold contact surface with a dry microfibre cloth or the edge of a clean cloth. Oils and oxidation on the contacts can interrupt the electrical connection with the phone's SIM reader.
Software Fixes
Restart the phone. A simple restart resets the SIM detection hardware and resolves temporary detection failures caused by a software glitch.
Check if the SIM is locked to a different carrier. If you have recently switched carriers or are using a SIM purchased outside Kenya, the phone may be network-locked. A SIM from Safaricom in a phone locked to Airtel will not register — contact the phone's original carrier to request an unlock, or use a local unlocking service.
Test the SIM in another phone. Insert your SIM into a different handset. If it is detected and works normally, the fault is with your phone's SIM reader. If it is not detected in another phone either, the SIM itself is faulty.
Hardware Causes
A SIM reader (the metal tray contacts inside the phone that make contact with the SIM) can become bent, corroded, or broken. This is more common on older phones and on devices that have had the SIM tray removed and reinserted frequently. A bent SIM reader spring can be carefully adjusted by a technician; a broken one requires replacement of the SIM reader component.
Reseat the SIM and test it in another phone before anything else. These two steps separate a SIM fault from a phone fault and determine the correct repair path immediately.
