I need to forward all my texts to another phone number. I do not have "forward your texts" option in Settings.

How can I forward all my texts from my iPhone to a different phone number?

I am sending my phone in for repair, but work from my iPhone. It is imperative to receive my text messages to my other phone while my iPhone is being repaired.

1. In Settings, I do not have an option to "Forward text messages"
2. Although, I do have an iPad and another phone which is Android based, and another iPhone.

What options do I have? Please help.