Basically, the majority of mixing problems result from the errors in the automatic mapping. It is not always the case that the field names correspond in a perfect manner when changing CSV to vCard, for example, Mobile No. vs. Phone or Company Name vs. Organization. Online tools decide the mapping by themselves, and thus, they are more likely to assign the wrong fields. In order to escape from this situation, you must have a CSV to VCF converter tool with manual field mapping so that you can be the one to decide which column goes where. Efficient converters analyze the layout of your CSV and precisely map the fields like name, email, address, company, and mobile. There are fewer instances of errors in the output when tools such as GainTools CSV to vCard Converter show mapping prior to the conversion process. Make sure that you check once again the fields before you export them to vCard versions 2.1, 3.0, or 4.0. The right mapping is a way of getting a clean import into Android phones, Outlook, Google Contacts, and CRM systems, without the mixing or losing of contact details.