How to Block All Known Numbers for a Single SIM in a Dual SIM Mobile

Mobile users often face the challenge of managing different SIMs for work, personal use, or various services. If you want to block all known numbers for one specific SIM in a dual SIM mobile phone, the process can vary depending on your device's operating system (Android or iOS) and manufacturer. Here’s a detailed guide to help you through the steps:

Android Devices

Android users can manage their call settings to block numbers for a specific SIM card. Here’s how you can do it:

Open the Phone App: Start by launching the default phone app on your device.

Access Call Settings: Look for the gear icon (or a three-dot menu) and tap on it to access the settings.

Select SIM Card: You might be prompted to choose which SIM card to manage from this section.

Block Numbers: Once you are on the correct SIM card, look for the section that allows you to block numbers. This might be under Call Blocking or a similar heading.

Use Do Not Disturb Mode (Optional): For additional peace and quiet, consider enabling the Do Not Disturb Mode. You can configure this mode to allow calls only from contacts on the other SIM or from unknown numbers.

iOS Devices

While iOS devices don’t have a built-in feature to block numbers by SIM card, you can still manage call blocking through the native settings or use third-party apps. Here’s how:

Open Settings: Start by going to the Settings app on your iPhone.

Phone Settings: Scroll down and tap on Phone.

Call Blocking Identification: Tap on Call Blocking Identification (you may need to scroll down a bit to find this option).

Select SIM Card: Unfortunately, iOS does not provide a built-in method to block numbers based on SIM card. You may have to manually block numbers or use third-party apps that offer more granular control options. Apps like Truecaller and Mr. Number can help with this.

Using Third-Party Apps

For more control over call blocking, consider using third-party apps. Here are a couple of options:

Truecaller: This app allows you to block numbers and may provide options to manage settings based on different SIM cards, depending on your device.

Mr. Number: This app offers advanced call blocking features and can be particularly useful for users managing multiple SIM cards.

Additional Tips and Cautions

When setting up these features, keep the following in mind:

Back Up Your Contacts: Always make sure to back up your contacts before making any changes. This helps prevent important numbers from being accidentally blocked.

Consider Impact: Blocking known numbers might inadvertently prevent important calls from reaching you. Make sure to review the list of blocked numbers carefully to avoid missing crucial calls.

If you have a specific phone model or operating system version, I can provide even more tailored instructions. Additionally, if you need help with any specific issues or further customization of these settings, feel free to ask!