Samsung Galaxy A12 was released in Q4 2020, runs on Android 10 out of the box, and is now running on Android 11 (One UI 3.1), which packs MediaTek Helio P35 SoC.
Having mid-range or higher-end phones like Samsung does not guarantee that the devices will not fall victim to any issues. The devices have faced issues in the past, and one of the most common problems is the no sim card detected error. Whether the Galaxy A12 is not detecting a sim card or throwing errors like No Service or No signal detected, we’ve listed some fixes to eliminate those issues.
In most cases, the sim card-related errors like No Sim Card Detected, No Service, etc., can be easily fixed. But, sometimes, the problem occurs when the sim card is damaged or there’s some network issue in your area. In any case, applying the fixes we have listed below is worth applying.
Also Read

Samsung Galaxy A12 Specs Overview
The Samsung Galaxy A12 is a budget phone with no AMOLED here. Instead, we get a 6.5-inch HD+ TFT display. In terms of performance, we will see an octa-core processor here, but we don’t know anything specific about this processor. Reports have said that it is the MediaTek Helio P35, but we will have to wait until the launch to get the official information. This phone will come in three RAM and storage variants: 3GB + 32GB, 4GB + 64GB, 6GB + 128GB. There is a MicroSD slot for storage expansion of up to 1TB.
After uninstalling Magisk on my Samsung Galaxy A12, phone no longer has network but displays emergency calls only. Please how do I resolve the issue.