I have a Samsung Galaxy Note. Suddenly, it does not recognise any SIM card. When I try to make a call, I get a message 'Not Registered on Network'. I have also notices that when I hold the power button, I no longer get the option of 'flight mode' etc... instead the phone just shutts down. Can someone help me understand the problem ?

If you have just forgotten it, you just do an Android Hard Reset.

How to Unlock Samsung Galaxy Note 8 by Code

https://www.codes2unlock.com > unlock > Galaxy-Note...

Instructions to Unlock Samsung Galaxy Note 8 ... 1. Insert the non-accepted sim card and power on. 2. Your phone prompts to enter "Sim Network Unlock Pin". 3.

Samsung Galaxy Note 8 Unlocking Instructions - How to ...

https://www.simplyunlocked.co.uk > unlocking-guides

Samsung Galaxy Note 8 Unlocking Instructions · Turn on the galaxy note 8 handset with a non accepted SIM card (Any other SIM card than the network the phone is ...

Unlock Samsung Galaxy Note 8 Phone ' Unlock Code ...

https://www.unlockbase.com > unlock-phone > galaxy-...

How to Unlock Samsung Galaxy Note 8? · 1 - Switch ON your phone with an unaccepted SIM Card, · 2 - The Phone will then ask for the Code or Password · 3 - You can ...

How to unlock Samsung Galaxy Note8 ' sim-unlock.net

https://sim-unlock.net > simlock > Galaxy_Note8

In order to receive a network unlock code for your Samsung Galaxy Note8 you need to provide IMEI number (15 digits unique number). It can be found by ...

Your sim card or network is not recognised or detected. Make sure that you can see your network displayed on your tablet. If no sim card or network is detected by your phone or tablet, you can only make emergency calls

hi, You can get the network unlock code for a Samsung E2120 from www.classicunlocking.com/samsung-e2120/rs16wp9/ at low cost.

==================================
UNLOCKING STEPS FOR SAMSUNG E2120
==================================
Method 1:

1 - Switch ON your Samsung E2120 with a NOT ACCEPTED SIM Card.
2 - Samsung E2120 will ask for "Password".
3 - Enter the Unlock Code.

OR (if the Samsung E2120 shows "Insert Correct SIM Card")

Method 2:

1 - Switch ON your Samsung E2120 with a NOT ACCEPTED SIM Card.
2 - Don't bother about what's being displayed on your Samsung E2120.
3 - Compose : #0111*CODE#.

NOT ACCEPTED: means to use a sim card from a network other than the network your Samsung E2120 is locked to.
CODE: Its the unique Unlock Code for your Samsung E2120.

If method 2 does not work, you can try method 2 again but this time without any SIM card on your Samsung E2120.

Do you want to unlock your SAMSUNG P1000 from network lock?
You can use unlock code to unlock it...Specify current network and country it's locked now and get the unlock code from the site Mobile-unlocker.com/samsung-p1000/rs2wp9/ and unlock it from service provider lock easily.You can follow the free Unlocking instructions below and unlock it step by step...


SAMSUNG P1000 Unlocking instructions:

Method 1:

1 - Switch ON your Samsung P1000 with a NOT ACCEPTED SIM Card.
2 - Samsung P1000 will ask for "Password".
3 - Enter the Unlock Code.

OR (if the Samsung P1000 shows "Insert Correct SIM Card")

Method 2:

1 - Switch ON your Samsung P1000 with a NOT ACCEPTED SIM Card.
2 - Don't bother about what's being displayed on your Samsung P1000.
3 - Compose : #0111*CODE#.

NOT ACCEPTED: We mean, to use a sim card from a network other than the network your Samsung P1000 is locked to.
CODE: Its the unique Unlock Code for your Samsung P1000.

If method 2 does not work, you can try method 2 again but this time without any SIM card on your Samsung P1000.

Hi,after getting codes for your mobile follow the instructions about how to unlock your mobile..
Warning: Do not enter any wrong unlock unlock codes on your Samsung SGH-F480 mobile phones. If you enter over a certain amount of wrong unlock codes on your mobile phone, your phone may get hard locked and sometimes become unusable.

Method 1:

1 - Switch ON your Samsung SGH-F480 with a NOT ACCEPTED SIM Card.
2 - Samsung SGH-F480 will ask for "Password".
3 - Enter the Unlock Code.

OR (if the Samsung SGH-F480 shows "Insert Correct SIM Card")

Method 2:

1 - Switch ON your Samsung SGH-F480 with a NOT ACCEPTED SIM Card.
2 - Don't bother about what's being displayed on your Samsung SGH-F480.
3 - Compose : #0111*CODE#.

NOT ACCEPTED: We mean, to use a sim card from a network other than the network your Samsung SGH-F480 is locked to.
CODE: Its the unique Unlock Code for your Samsung SGH-F480.

If method 2 does not work, you can try method 2 again but this time without any SIM card on your Samsung SGH-F480.

Each Samsung SGH-F480 mobile phone has an unique unlock code.
i got instruction from mobileunlockguide

Totally Samsung Has 5 Unlocking attempts If it finish means you cannot Unlock it,Your Phone get hard locked ,hard locked means you cannot unlock it using the code,So how many tries Finished!!!!
You can get the Unfreeze Code at here Theunlockarena.com and Unfreeze it,the Unlock code there is Correct and safety,you can get the Instructions below and unlock it step by step...

Samsung T919 Unlocking InstructionsWarning : Do not enter any wrong unlock codes on your Samsung T919 mobile phones. If you enter over a certain amount of wrong unlock codes on your Samsung T919 mobile phone, your phone may get hard locked and sometimes become unusable.
Method 1:

1 - Switch ON your Samsung T919 with a NOT ACCEPTED SIM Card.
2 - Samsung T919 will ask for "Password".
3 - Enter the Unlock Code.

OR (if the Samsung T919 shows "Insert Correct SIM Card")

Method 2:

1 - Switch ON your Samsung T919 with a NOT ACCEPTED SIM Card.
2 - Don't bother about what's being displayed on your Samsung T919.
3 - Compose : #0111*CODE#.

NOT ACCEPTED: We mean, to use a sim card from a network other than the network your Samsung T919 is locked to.
CODE: Its the unique Unlock Code for your Samsung T919.

If method 2 does not work, you can try method 2 again but this time without any SIM card on your Samsung T919.

You need to unlock your samsung b2100 network first before you can use that sim card, To unlock samsung b2100 you must know what the original network from that phone. Example if you buy that phone from At&t vendor you will need samsung unlock code for at&t network, got it? After you have appropriate unlock code for your phone, you just need enter that code and your samsung b2100 can accept any sim card from other network. I hope my solution can help you to solve your problem.

There are lot ways To Unlock the Phone ,but Unlock code is easy and Correct way to Unlock the Phone from Network Lock,You need to specify the Current Network Lock and Country and get the Unlock code at here Onlinegsmunlock.com
and Unlock it,then You can use it any GSM Network ...You can follow the instructions below and Unlock it step by step..

Samsung SGH-T459 Gravity Unlocking Instructions Warning : Do not enter any wrong unlock codes on your Samsung SGH-T459 Gravity mobile phones. If you enter over a certain amount of wrong unlock codes on your Samsung SGH-T459 Gravity mobile phone, your phone may get hard locked and sometimes become unusable.
Method 1:

1 - Switch ON your Samsung SGH-T459 Gravity with a NOT ACCEPTED SIM Card.
2 - Samsung SGH-T459 Gravity will ask for "Password".
3 - Enter the Unlock Code.

OR (if the Samsung SGH-T459 Gravity shows "Insert Correct SIM Card")

Method 2:

1 - Switch ON your Samsung SGH-T459 Gravity with a NOT ACCEPTED SIM Card.
2 - Don't bother about what's being displayed on your Samsung SGH-T459 Gravity.
3 - Compose : #0111*CODE#.

NOT ACCEPTED: We mean, to use a sim card from a network other than the network your Samsung SGH-T459 Gravity is locked to.
CODE: Its the unique Unlock Code for your Samsung SGH-T459 Gravity.

If method 2 does not work, you can try method 2 again but this time without any SIM card on your Samsung SGH-T459 Gravity.

I would recommend re-image your phone. It's safe and quite easy. Also it can be done just with your computer and cable, for free.