This happens mostly when VCF files are copied through apps or editors that reformat the data. The structure of the contacts is restored; thus, some of the fields are deleted or rearranged.
Should you need to merge VCF files manually, open them in Notepad and copy all your contacts into one file. Ensure that each contact is kept within BEGIN:VCARD and END:VCARD lines. Don’t edit anything inside the block, just join them one after another.
Manual method works, but with large files it’s easy to miss lines or break formatting.
If there are too many files, a merge tool like WholeClear Merge vCard Software can be used because it just combines files without changing the internal structure.
Keep a backup before merging, because once formatting is broken, fixing it manually takes time.
