Import Vcard (.vcf file) to Nokia 3310 3G phone

Question

I want to import a .vcf file (with many contacts exported from an iphone) into a Nokia 3310 3G cell phone. I'm doing a test file first. The procedure is:

1. load the file on a PC
2. change the format of the file to be acceptable to the phone
3. copy (via cable) the .vcf from a PC to Files>Phone memory>vCard
4. disconnect the phone from the PC
5. Files>Phone memory>vCard>
6. Select .vcf file
7. Menu (soft button)
8. Save vCard

The phone gives an error message: "Something went wrong." Apparently Nokia uses a subset of a vCard standard (Ref: vCard 2.1 example - Wikipedia) I've tried to format the file with various syntax that I've researched such as:

BEGIN:VCARD

VERSION:2.1

N;FirstName;LastName;;

TEL;CELL;VOICE:123567890

END:VCARD

And,

BEGIN:VCARD

VERSION:3.0

FN;CHARSET=UTF-8:FirstName LastName

TEL;CHARSET=UTF-8;TYPE=CELL:[phone]

END:VCARD

There are some Excel macros to import vCards into Excel and then export them (Ref: "How to create a vcf file from xls file containing mobile contacts"). I use Libre Office.

A tried a downloadable program (vcf222) which claimed it would reformat a .vcf file. It is described in Nokia Power User. It doesn't work for my .vcf file and phone.

I'm using Windows 10. I tried to import the .vcf file into People (so as to try to export it to a spreadsheet, modify it and export it) but I do not use this App and it proved to difficult.

I'd like to know which .vcf format the 3310 3G uses. Then I could use Notepad++ to modify my file. I'd love to know an easier way.