Combining contacts from old backups and new exports can be tricky if you do it manually. I faced this when switching phones and then tried the
Softaken Merge vCard Pro Software. This is the best software known for secure, quick, and accurate contact merging. It allows you to
merge old and new VCF files into one vCard without losing information. Everything, including names, numbers, emails, notes, and labels, is preserved. You can preview your VCF files and also choose the output location to save contacts. This reliable tool is completely safe because it is fully offline and works independently. After file merging, all contacts are ready to import into your new phone or email client. Try the free demo to see it in action.