Dual sim error

[Lewboi]

I've been using Galaxy M12 for like 1year now.. my dual sim isn't working and i was wondering what makes Both sim not working just got my phone reformated due to screen lockout 

[butete]

best have it checked by authorized samsung service center

[TeamGalaxyRene]

Hello Lewboi,

Sorry to hear that, about your experience with your Samsung Galaxy M12 having issues with non-working dual SIM and we apologize for the inconvenience it caused you.

Before you try out the recommendations below, be sure to check if your device's software and related apps are updated to the latest version. To update your mobile device's software, follow these steps:

Step 1. Go to Settings > Software update.

Step 2. Tap on Download and install.

Step 3. Follow the on-screen instructions.

Step 4. Reset your device.

Depending on your smartphone it will either come with a dual SIM or a single SIM tray. Dual SIM models allow you to use two SIM cards in one device. This is handy if you have separate phone numbers for work and home or if you would like to use a local number while keeping your original number active when in a foreign country. 

Types of SIM card.

Dual SIM card trays feature 2 SIM card slots, where a hybrid SIM tray features 1 SIM card slot and a hybrid slot. A hybrid slot can take either a second SIM card or a microSD card for expandable memory, giving you the flexibility to choose between a second SIM card or extra storage.

You can check by removing the SIM card tray and seeing how many slots it has and how the second slot is labeled, if it says SIM2 it's a dual SIM, if it says SIM2 microSD it's a hybrid. 

Activate dual SIM card feature.

Step 1. Go to Settings, then tap Connections.

Step 2. Tap SIM card manager.

Step 3. Tap the SIM card that you would like to enable.

Step 4. Tap the switch to the right to activate the SIM card.

Step 5. Enter your preferred SIM card name, then tap Done.

Step 6. Select your preferred icon then tap OK.

https://www.samsung.com/ph/support/mobile-devices/how-to-use-or-manage-dual-sim-cards/  

If that doesn't work, probably the SIM card that were used earlier were locked while on your previous phone. You may try other SIM cards on both SIM card tray if its working or try below.

SIM card lock protect your SIM from being used on other Mobile Devices. To learn how to lock/unlock your SIM card, follow these steps:

Step 1. Tap Settings.

Step 2. Tap Lock screen and security.

Step 3. Tap Other security settings.

Step 4. Tap Set up SIM card lock.

Step 5. Tap Lock SIM card and you will be prompt to enter the PIN number
By default, the PIN number will be 1234.

When SIM card lock is activated, you can tap on Change SIM card PIN to change to a new PIN number.

Step 6. To disable SIM card lock, tap Lock SIM card again and enter the PIN number.

If that does not work, then, we recommend that you immediately bring your device to the nearest Samsung Authorized Service Center.

https://www.samsung.com/ph/support/service-center/

For more assistance, you may contact us on our online Samsung support channels below.

https://samsung-livechat.sprinklr.com/seao/ph/index.html 

https://www.samsung.com/ph/support/contact/#onlinesupport  

Or contact our Samsung direct hotline numbers below.

#GALAXY or #425299 [Mobile Phones & Tablets]

Available 24/7

1-800-10-7267864 [All Product, Toll Free, PLDT]

1-800-8-7267864 [All Product, Toll Free, Globe]

842 221 11 [All Product, Landline]

Daily (8:00am to 8:00pm)

Be sure to click "ACCEPT AS SOLUTION" when you find our answers helpful to you.