The format of MSIDN

MSISDN is a number used to identify a mobile phone number internationally. It is an acronym for Mobile Station International Subscriber Directory Number.The E.164 numbering plan defines this. This number contains a country code and a National Destination Code which identifies the subscriber’s operator. An example of a valid MSIDN in Cameroon is 237676676676.

Angular file upload with firebase

You can take the easy way out and head to https://www.npmjs.com/package/ng-firebase-file-upload and follow the guidelines set out for you and be done with it. You can get the code from the github repository https://github.com/diyen1/ng-firebase-file-upload . You are welcome to edit the styling as there will be default styling there that may suit your application style.