If you can still access the dial pad (sometimes reachable via an "Emergency Call" button or if the phone asks for a code on a home screen), you can perform a Full EEPROM Reset
A quick search will reveal numerous websites claiming to generate unlock codes for free. These sites often ask for your IMEI number (obtained by dialing *#06# ) and then promise to email you the password.
Factory reset is useful only if you’ve forgotten the phone’s own lock code (not SIM-related). The SM-B312E has a phone lock feature separate from SIM lock.
First, a critical distinction. When the SM-B312E asks for a , it is not asking for your phone’s screen lock. samsung sm-b312e sim lock password
Entering common defaults like 0000 , 00000000 , or 12345678 will almost always result in a "Wrong Password" error. If you attempt this too many times, the phone may permanently lock the security layers, rendering it unusable with any SIM card.
If you search online forums or YouTube comments, you will often see claims of universal codes or "master passwords" that can unlock the SM-B312E instantly.
This article is for educational purposes. Unlocking a phone may void warranties or violate carrier agreements in some regions. Always check local laws. The author is not responsible for any damage caused by using service codes. If you can still access the dial pad
If your SM-B312E says “SIM lock password” after inserting a different carrier’s SIM, you are dealing with a network subsidy lock , not a PIN.
If your SIM itself is locked after 3 wrong attempts, you must contact your network provider for a Personal Unlocking Key (PUK) 💻 Advanced Unlocking (Flashing)
If the SIM card itself is locked because of too many incorrect PIN attempts, the phone will ask for a . The SM-B312E has a phone lock feature separate from SIM lock
The Samsung SM-B312E is a durable, long-battery-life feature phone—often called a "dumb phone"—popular in regions like India, Southeast Asia, Africa, and Eastern Europe. It’s designed for calling, texting, and basic music playback. However, one of the most frequent frustrations for users is the dreaded prompt.
Have you successfully unlocked your Samsung B312E? Share your experience in the comments below.
If software codes fail, technicians often use specialized GSM boxes or software tools to "read" or "reset" the lock codes. How to Unlock Sim Card / Sim locked by Pin Code or PUK Code