This usually happens due to incorrect conversion or missing field mapping because you did it by the manual method. So now you want to correct it? Then you need to use the expert offline contact conversion tool. This is the best and most secure way to safely convert. I faced this issue before many times, and then one day someone suggested to me reliable software that easily handles large files and ensures the data remain safe and accurate. The tool is called
WholeClear CSV to VCF Converter, an offline, independent, and fully Windows-based utility that also offers a preview option. Once the CSV data was properly converted with correct field alignment, all contacts appeared on iPhone without missing entries. Best for beginners and professional users who want quick, safe, and accurate contact management. A free trial is also available now for all users. Download for more details.