how to turn off 2 factor ID

Generally, Two-Factor Authentication (2FA) can’t be turned off.

That said, if it’s hindering use of your device(s) something else might be wrong.

Is there a particular issue with which we might assist.

See if this primer helps:

Two-factor authentication for Apple ID - Apple Support

Good question.

First … you don’t normally receive the 2FA code message by “text” but rather by “data.”

It seems a minor nuance, but it means that you CAN receive the messages via WiFi in an area where there is no “cell” coverage.

Next … ANY of your devices can generate the code even if they are COMPLETELY off-network. (For example, to allow you to log-in to your iCloud from an untrusted “Ethernet-Only” computer)

On your iPhone it’s in Settings -> AppleID (Name) -> Password & Security -> Get Verification Code.

iPads and Macs have a similar mechanism.

Lastly, while you can’t receive the codes via e-mail directly from Apple, you CAN receive them via SMS or “automated voice” call to ANY phone number you have pre-configured as your “trusted number(s)”