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diff --git a/Notes.md b/Notes.md
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+++ b/Notes.md
@@ -15,3 +15,7 @@ https://stackoverflow.com/questions/33588459/what-is-android-multidex
 ### What does " tools:ignore="GoogleAppIndexingWarning"" mean?
 
 ### What does "tools:replace="android:label, android:allowBackup"" mean?
+
+### Obtaining Phone Number
+Scheint nicht garantiert zu sein. Ggf. Device ID doch besser -> Use Case des Wechsels ggf. haeufiger notwendig
+https://stackoverflow.com/questions/2480288/programmatically-obtain-the-phone-number-of-the-android-phone
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