How to get Defender app to coexist with apps that provide complementary protection but unfortunately also uses their own VPN?

You're very welcome, Sunny, and I truly appreciate your thoughtful questions. You’re asking exactly the kind of practical, everyday question most people wonder but don’t say out loud.

Can Microsoft Defender turn on only when using Microsoft apps like Excel?

• No, not automatically on iPhone or iPad. iOS doesn’t allow Defender to turn itself on just when you open a Microsoft app like Excel or Outlook.

But you’re right, Microsoft would want that too, and they’ve made it work better inside their own apps.

If you download files (like Excel spreadsheets) using Microsoft apps like Outlook, OneDrive, Teams, or Edge, Defender can still scan those files.

It helps most when using Microsoft Edge browser, not Safari.

If you download spreadsheets often, try using Microsoft Edge instead of Safari. That way, Defender can help more without needing to fight over VPN with your other apps.

Hi Sunny, thank you again for your message, I completely understand how frustrating it is to pay for multiple apps, only to have them cancel each other out. You're definitely not alone in this, and I'm here to help make it clearer.

You're right to compare them.

Whoscall is likely better for everyday use, especially for checking phone numbers, SMS, and risky websites common among regular users. It's popular in Asia and partners with Google and telecom companies, so it probably has a larger database for calls and scam sites.

Microsoft Defender is built for businesses, protecting email links, downloads, and phishing, especially if you're using Office 365. It's more focused on corporate-style threats.

The problem is, both apps use a "VPN-like" function on iOS to scan traffic, and iOS only allows one VPN at a time, so they can’t both be active together. If you turn on Whoscall, Defender stops. If you turn on Defender, Whoscall stops.

Microsoft Defender’s VPN is not a full VPN; it's only used to scan web traffic for phishing. It doesn’t encrypt traffic the same way or protect your identity across websites like your main VPN does. Microsoft even says this in their documentation.

So yes, your VPN is better for privacy and safety on public Wi-Fi.

I know it feels like you shouldn't have to manage all this when you're already paying for good apps. Unfortunately, this is a limit in iOS, not your fault, and not something the apps can change right now.

Regards,

Arlene D.

Hi Sunny, thanks for getting back to me.

On iOS, only one VPN can be active at a time. This means you can't fully use Microsoft Defender, Whoscall, an ad blocker, and another VPN app all together if they each install their own VPN. Apple doesn’t currently support “cascading” or stacking VPNs. So when one app’s VPN turns on, the others get turned off automatically.

Split tunneling is a feature some VPN apps offer where only some traffic goes through the VPN and the rest goes directly. But iOS doesn’t support advanced split tunneling like Windows does, so it won’t help much for your case if each app needs its own VPN to work.

Your best option may be to:

Choose one app’s VPN to stay on (like Defender or your main VPN).

Check if the other apps (like Whoscall or your ad blocker) can still work partly without needing their VPN.

Regards,

Arlene D.

Thanks I would prefer VPN drivers cascaded to achieve complementary protection; my use case for apps that unfortunately install their own VPN

1. VPN protects me from untrusted WiFi
2. Microsoft Defender scans files like downloads and phishing
3. Whoscall to screen call and SMS
4. Adblock app

How would split tunnel achieve above protection?

Thanks in advance for your help!

Hi there, I'm Arlene, an Independent Advisor. Thanks for reaching out to Microsoft Community.

By the way, are you using Windows Defender alongside other security apps that include their own VPN features?

When Defender and other security apps both use VPN functions, conflicts can happen because multiple VPNs try to control your network at once. To get them to work together, you can try enabling “split tunneling” in the VPN apps if available, this lets only certain apps send traffic through the VPN, while Defender and other protections run normally on your regular connection.

Also, check the settings in each app for options to exclude other security apps from their VPN or firewall controls. Microsoft’s official support pages suggest avoiding running multiple VPNs simultaneously and making sure all apps are updated for best compatibility.

Have you checked if your VPN or security apps offer split tunneling or app exclusions to help them coexist?

Regards,

Arlene D.