(参考)AT&T Wi-Fi Passpoint (w/ EAP-AKA) のiOS用プロファイル

Portable Wi-Fi Hotspots & Mobile Wi-Fi Plans - AT&T
https://www.att.com/shop/wireless/wifi.html

At&T Wi-Fi Passpoint
https://passpoint.attwifi.com/

iOSでアクセスするとプロファイルが落とせるが、プロファイルのダウンロードに認証が求められないのでEAP-AKAかEAP-SIM認証のはず。

落としてApple Configurator 2で署名削除してみたらこんな感じだった。
EAPTypesが23なので、EAP-AKA。
MCC(310)とMNC(410)が埋め込まれてる。

<?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>ConsentText</key>
	<dict>
		<key>default</key>
		<string>You understand that installation of this profile will configure your device to automatically connect at Wi-Fi Passpoint-enabled hot spots where AT&amp;T Mobility subscribers are authorized. You agree that you will not install this profile (i) if you are not running Apple iOS 9.0 or later, or (ii) if you are not an AT&amp;T Mobility subscriber. If you choose to install the profile on other devices, you do so at your own risk. All connections are subject to the Terms of Service that apply at that hot spot, including the AT&amp;T Wi-Fi Terms of Service available at http://www.att.com/legal/terms.wiFiServices.html.

If you wish to discontinue automatic connection at Passpoint-enabled hot spots, please delete the profile from your Wi-Fi settings.

</string>
	</dict>
	<key>PayloadContent</key>
	<array>
		<dict>
			<key>AutoJoin</key>
			<true/>
			<key>DisplayedOperatorName</key>
			<string>AT&amp;T Wi-Fi Passpoint</string>
			<key>DomainName</key>
			<string>attwifi.com</string>
			<key>EAPClientConfiguration</key>
			<dict>
				<key>AcceptEAPTypes</key>
				<array>
					<integer>23</integer>
				</array>
			</dict>
			<key>EncryptionType</key>
			<string>WPA2</string>
			<key>HIDDEN_NETWORK</key>
			<false/>
			<key>IsHotspot</key>
			<true/>
			<key>MCCAndMNCs</key>
			<array>
				<string>310410</string>
			</array>
			<key>PayloadDescription</key>
			<string>Configures Wi-Fi settings</string>
			<key>PayloadDisplayName</key>
			<string>Wi-Fi</string>
			<key>PayloadIdentifier</key>
			<string>com.apple.wifi.managed.4A766A24-2257-4132-A68C-37FFEB2054E5</string>
			<key>PayloadType</key>
			<string>com.apple.wifi.managed</string>
			<key>PayloadUUID</key>
			<string>4A766A24-2257-4132-A68C-37FFEB2054E5</string>
			<key>PayloadVersion</key>
			<real>1</real>
			<key>ProxyType</key>
			<string>None</string>
			<key>ServiceProviderRoamingEnabled</key>
			<true/>
		</dict>
	</array>
	<key>PayloadDescription</key>
	<string>This profile enables highly-secure, automatic connections for AT&amp;T Mobility subscribers at participating public hot spots.</string>
	<key>PayloadDisplayName</key>
	<string>AT&amp;T Wi-Fi Passpoint</string>
	<key>PayloadIdentifier</key>
	<string>com.attwifi.passpoint</string>
	<key>PayloadOrganization</key>
	<string>AT&amp;T</string>
	<key>PayloadRemovalDisallowed</key>
	<false/>
	<key>PayloadType</key>
	<string>Configuration</string>
	<key>PayloadUUID</key>
	<string>325CDD32-3E59-40A1-9E78-F4A95044E813</string>
	<key>PayloadVersion</key>
	<integer>1</integer>
</dict>
</plist>

なるほど。