[mobile-broadband-provider-info] de: add coments about different APN of Deutsche Telekom

[Thomas Haller <thaller src gnome org>]

commit 61ff50bbdf19ad5b07c86bb68f3bb1f0c3f69e0a
Author: Thomas Schäfer <tschaefer t-online de>
Date:   Thu Apr 1 20:48:47 2021 +0200

    de: add coments  about different APN of Deutsche Telekom
    
    [thaller redhat com: adjust whitespace and commit message]
    
    https://gitlab.gnome.org/GNOME/mobile-broadband-provider-info/-/merge_requests/28

 serviceproviders.xml | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/serviceproviders.xml b/serviceproviders.xml
index 30f0514..5321ce3 100644
--- a/serviceproviders.xml
+++ b/serviceproviders.xml
@@ -3443,6 +3443,7 @@ conceived.
                        <balance-top-up>
                                <ussd replacement="CODE">*101*CODE#</ussd>
                        </balance-top-up>
+                       <!-- ipv4-only APN, deprecated, but still popular, without CGN -->
                        <apn value="internet.t-d1.de">
                                <plan type="postpaid"/>
                                <usage type="internet"/>
@@ -3450,6 +3451,7 @@ conceived.
                                <dns>193.254.160.1</dns>
                                <dns>193.254.160.130</dns>
                        </apn>
+                       <!-- dual stack or ipv4-only APN, type ipv4v6 or ipv4 -->
                        <apn value="internet.t-mobile">
                                <plan type="postpaid"/>
                                <usage type="internet"/>
@@ -3458,10 +3460,14 @@ conceived.
                                <dns>10.74.83.22</dns>
                                <dns>193.254.160.1</dns>
                        </apn>
+                       <!-- 
https://telekomhilft.telekom.de/t5/Blog/Neuer-IPv6-Zugang-zum-mobilen-Internet-im-Netz-der-Telekom/ba-p/4254741
 -->
+                       <!-- IPv6-only APN, type ipv6 or ipv4v6  -->
                        <apn value="internet.v6.telekom">
                                <plan type="postpaid"/>
                                <usage type="internet"/>
                        </apn>
+                       <!-- 
https://www.telekom.de/hilfe/mobilfunk-mobiles-internet/mobiles-internet-e-mail/apn-mobilfunk/wie-lauten-die-apn-fuer-mobilfunk
 -->
+                       <!-- dual stack or ipv4-only APN, type ipv4v6 or ipv4 -->
                        <apn value="internet.telekom">
                                <plan type="postpaid"/>
                                <usage type="internet"/>