Steps (Using Google Contacts as an example)

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Method 5: Importing from a CSV File (Advanced Users/Bulk Import)
CSV (Comma Separated Values) files are plain text files that store tabular data. They are incredibly useful for importing a very large number of contacts, especially if you have them in a spreadsheet format (e.g., from a CRM, a database, or a mass export).

Prerequisites:

A CSV file formatted correctly. The column headers in your germany phone number list CSV must match the fields recognized by your contact platform (e.g., "Name," "Phone Number," "Mobile Phone," "Email Address"). The phone number column is the most crucial for WhatsApp.
A Google account (recommended for Android/universal use) or an Outlook account. You'll import the CSV into one of these web-based contact managers first.

Open Google Contacts on your computer (contacts.google.com).
In the left sidebar, click "Import."
Click "Select file" and choose your CSV file.
Click "Import." Google Contacts will try to map the columns in your CSV to its contact fields. You might need to manually align some if they're not recognized automatically.
Review and correct any errors. After importing, review the contacts in Google Contacts to ensure accuracy. Merge duplicates if necessary.
Ensure your Android phone (or iPhone with Google sync enabled) is syncing with this Google account.
Refresh WhatsApp contacts.
Common CSV Formatting Tips for Phone Numbers.