fax line

Does tmobile have efax service or does it come with our service ? How it works ? Is it secured ?

I have a t-mobile number attached to my account for an accessory addition. Can this number be added for the option 4 voicemail "Fax Forwarding Number" that the prompt of number 4 on voice mail requires to be setup.  If so how can this work when there is no actual fax machine at that number.  Nothing is at that number.  Seems like a hopeless dream.  Will have to subscribe to some fax app.  Please reply if you have any insights or found the ability to use this t-mobile fax option without an actual fax machine connected to same.

Consulta la Opciones del buzón (4) on our Voicemail Menú de configuración. There’s a Fax Option you can use through the voicemail menu. That may be the option you'll want to use for that spare line.