FRITZ!Box 7530 Service - Knowledge Base
Maximum number of entries in the FRITZ!Box's telephone books
You can create up to 1000 entries in each of your local FRITZ!Box telephone books, and telephone books from email accounts (online telephone books) should contain a maximum of 1000 entries. If you have more entries than this, it can take longer to open the user interface and slow navigation down noticeably.
Note:The FRITZ!Box does not limit the number of telephone books. Experience has shown that you can use at least 20 telephone books.