Q:

What does "unregistered SIM" mean?

A:

A message reading "unregistered SIM" means that a phone is not authorized by a service provider. According to TracPhone, this error message typically disappears after the network registers the device to which the SIM card is attached.

SIM cards provide the connection between a phone and a phone provider. GSM infrastructure, with which SIM cards work, requires that phones be authorized before they can be used. Most phones register automatically after a short period of time. In some cases, it might take some time for this to occur. Some providers require users to call their service providers before their phone is registered. If the "unregistered SIM" message continues, the SIM card may be faulty.

Sources:

  1. tracfone.com

Is this answer helpful?

Similar Questions

  • Q:

    How do you unlock a mobile phone for free?

    A:

    To unlock a device for free, a mobile phone owner can submit a request to his service provider. AT&T, Sprint and T-Mobile give individuals the option to unlock their cell phones online. Generally, users should wait until the end of their contract term for greater success.

    Full Answer >
    Filed Under:
  • Q:

    How can I block a number from calling my mobile phone?

    A:

    The ability to block a number from calling a mobile device varies by service provider. For example, both Verizon and AT&T offer services that temporarily block certain callers from calling a specific mobile number. Some cell phones also offer settings to block individual callers.

    Full Answer >
    Filed Under:
  • Q:

    How do you make a SIM card work in another phone?

    A:

    If a cell phone doesn't have a SIM lock, insert the SIM card into the new phone and it should work so long as the phone supports the carrier's frequency band. Most cell phones have a SIM lock that prevents access to the network if the SIM card belongs to another carrier. If inserting a new SIM card prompts a request for a carrier code, the phone is SIM locked.

    Full Answer >
    Filed Under:
  • Q:

    Can you use an AT&T SIM card in a T-Mobile phone?

    A:

    An AT&T SIM card may be used in a T-Mobile phone if the phone is unlocked. SIM cards may be used in phones from different companies if the SIM card slot is the same size and if the phone is unlocked.

    Full Answer >
    Filed Under:

Explore