If you insert an activated SIM card into your smartphone and "Invalid SIM" is displayed, the following reasons may be responsible.
● The device is SIM-locked
⇒ Please check with the carrier or retailer where you purchased your smartphone for instructions on how to unlock the SIM lock.
● Poor contact or dirty SIM card
⇒ If fingerprints or dirt are attached to the SIM card, the device may not be able to read it properly.
Gently wipe the SIM card and SIM tray with a soft cloth, reinsert the card, and try restarting your device.
● SIM card malfunction or physical damage
⇒ If the SIM card is damaged or scratched, it may no longer be readable by your device.
In this case, a SIM card replacement is required. Please contact Customer Support at the details below.
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Contact Us:
UNIVERSAL Mobile Customer Support
Email: customer@universalmobile.us
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