The easiest way to get all of the relevant contact information is to download the appropriate .vcf file. You would select the best option, and your contacts will load all of the appropriate information including my [Cellular] Number, [International] Home Number, and [Fax] Number. Also, you would get my contact directory, email address, and mailing address. You would just select the Add or Save button. If you live outside of the US, I have 3 other countries you can choose from. Note, you are responsible for any calls made to me. I will not reimburse you for international long distance calls. This is not a problem for countries with domestic numbers, but if your country is not listed, I will suggest that you use WhatsApp. Any calls to you will show my [Cellular] Number.
If you want to make things harder for you, you can go to http://fsp.tel, and manually input the numbers. Again, you would want to make sure you add my [Cellular] Number as that is the phone I will likely call back from. If you are familiar with SIP protocols, you can dial my [SIP] Number. This will likely be a free call from both parties. Even if I was to use my SIP client, my [Cellular] Number may show up as the caller.