iOS mobileconfig file for forcing IPv4 on Bell Mobility cellular data APN to resolve VPN connectivity issues - https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA1Ki000000fxlXKAQ&lang=en_US

Bell Mobility-IPv4.mobileconfig

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>PayloadContent</key>
    <array>
        <dict>
            <!-- Configures the initial network connection APN -->
            <key>AttachAPN</key>
            <dict>
                <key>Name</key>
                <string>pda.bell.ca</string>
                <!-- Use IPv4 only (value 1) -->
                <key>AllowedProtocolMask</key>
                <integer>1</integer>
            </dict>
            <!-- Overrides specific settings for Data and Hotspot APNs -->
            <key>APNs</key>
            <array>
                <!-- Primary Bell Smartphone Data settings -->
                <dict>
                    <key>Name</key>
                    <string>pda.bell.ca</string>
                    <!-- Ensure IPv4 is used for data and roaming -->
                    <key>AllowedProtocolMask</key>
                    <integer>1</integer>
                    <key>AllowedProtocolMaskInRoaming</key>
                    <integer>1</integer>
                    <key>AllowedProtocolMaskInDomesticRoaming</key>
                    <integer>1</integer>
                </dict>
                <!-- Secondary/Tethering settings (inet.bell.ca) -->
                <dict>
                    <key>Name</key>
                    <string>inet.bell.ca</string>
                    <!-- Ensure IPv4 is used for tethering/alt data -->
                    <key>AllowedProtocolMask</key>
                    <integer>1</integer>
                    <key>AllowedProtocolMaskInRoaming</key>
                    <integer>1</integer>
                    <key>AllowedProtocolMaskInDomesticRoaming</key>
                    <integer>1</integer>
                </dict>
                <!-- Alternate Smartphone Data settings (pda2.bell.ca) -->
                <dict>
                    <key>Name</key>
                    <string>pda2.bell.ca</string>
                    <!-- Ensure IPv4 is used for alternate data APN -->
                    <key>AllowedProtocolMask</key>
                    <integer>1</integer>
                    <key>AllowedProtocolMaskInRoaming</key>
                    <integer>1</integer>
                    <key>AllowedProtocolMaskInDomesticRoaming</key>
                    <integer>1</integer>
                </dict>
            </array>
            <key>PayloadDescription</key>
            <string>Configures Bell Mobility Data and Hotspot (Strict IPv4)</string>
            <key>PayloadDisplayName</key>
            <string>Bell Mobility APN (IPv4)</string>
            <key>PayloadIdentifier</key>
            <string>com.bell.apn.config</string>
            <key>PayloadType</key>
            <string>com.apple.cellular</string>
            <key>PayloadUUID</key>
            <string>8f2e91bb-a4bf-4725-8ee3-b311b311b311</string>
            <key>PayloadVersion</key>
            <integer>1</integer>
        </dict>
    </array>
    <key>PayloadDisplayName</key>
    <string>Bell Mobility Settings (IPv4 Only)</string>
    <key>PayloadIdentifier</key>
    <string>com.bell.profile</string>
    <!-- Allows the user to remove this profile -->
    <key>PayloadRemovalDisallowed</key>
    <false/>
    <key>PayloadType</key>
    <string>Configuration</string>
    <key>PayloadUUID</key>
    <string>2d08e545-7b7a-47f4-95f0-b311ce11b311</string>
    <key>PayloadVersion</key>
    <integer>1</integer>
</dict>
</plist>