How to Unlock the Ericsson F3507G Mobile Broadband MiniCard

Updated April 17, 2017

The Ericsson MiniCard (SIM card) works with mobile carriers such as AT&T and T-Mobile. If you want to switch networks, you must unlock your MiniCard. This includes obtaining a PIN Unlock Key (PUK) from your mobile carrier. Once you have a PUK code, you can use a PIN to further secure your mobile phone from unauthorised use.

Contact your mobile carrier. Request a PIN Unlock Key (PUK). Verify your full name, street address, telephone number and account number.

Enter the eight-digit PUK code. Press the "OK" button.

Enter a new PIN number. It should be between four and eight digits in length. Press the "OK" button.

Re-enter the PIN number. Press the "OK" button. You now have unlocked your Ericsson MiniCard.


Entering the PUK code 10 times incorrectly will lock your MiniCard permanently.

Things You'll Need

  • PUK
  • PIN number
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About the Author

Based in Massachusetts, Chanel Adams has been writing since 2009. Her work has been published by the "Lowell Sun,", Coed Media and other print and online publications. She has knowledge in fashion, careers, health, education, computers and electronics. Adams has an Associate of Science in administrative medical assisting from San Joaquin Valley College.