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https://hilfe-center.1und1.de/article/795185
https://hilfe-center.1und1.de/article/795369
https://hilfe-center.1und1.de/mobilfunk-c83940/sim-karten-c84084/1und1-sim-karte-nach-kartentausch-aktivieren-a787073.html
https://hilfe-center.1und1.de/mobilfunk-c83940/sim-karten-c84084
https://praxistipps.chip.de/1und1-sim-karte-aktivieren-so-gehts_49499
https://tipps.computerbild.de/internet/verbindung/1und1-sim-karte-aktivieren-so-funktioniert-der-kartentausch-501987.html
https://www.facebook.com/1und1/posts/gute-neuigkeiten-f%C3%BCr-11-mobilfunk-kunden-ab-heute-k%C3%B6nnen-sie-im-control-center-u/10150193806698679/
https://play.google.com/store/apps/details?id=com.oneandone.controlcenter&hl=de
https://www.netzwelt.de/sim-karte/160720-sim-aktivieren-so-schaltet-neue-karte-frei.html
https://www.gutefrage.net/frage/11-simkarte-funkt-nicht
https://www.1und1-vertriebspartner.de/handbuecher/1und1_Mobile_Handbuch.pdf
https://www.ionos.de/hilfe/mein-konto/