Making SMS verification codes easily copyable

Question

I am sending users a 10 digit numbers and letters code through text as a method of 2FA. My use case is a bit different -- not your typical login 2FA code, but rather a passcode that can be used to unlock an encrypted document. This is why my codes need to be longer than just a few digits.

I'm looking for it to be easily copyable by users -- sometimes iPhone makes it so you can click a code in text and easily copy it. This appears on 6-digit numeric, but doesn't appear to be working for anything above 9 digits as far as I can tell.

Is there a set pattern that can tell iPhone that the code being sent is a verification code? Like a digit threshold or a format?

My current message looks something like this:

Thank you for signing up for XYZ. Your verification code is: JWtCtWJmD2g

I am also thinking about just sending just the code (with no description) or sending two messages -- an introduction and then the code on separate lines.

Answer 1

As of February 2020, there appears to be no standardized format for SMS 2FA codes. There is currently a proposal from an engineer at Apple to create a unified format for SMS delivery.

I have found that iPhone is good at picking up "Here is your code: _____" regardless of how many digits / alphanumeric as long as:

• 10 or fewer characters
• Not a real word
• No special characters (@, &)
• The code is on the same line as "here is your code:"
• There is at least 1 digit and it is not on the end of the string surrounded by letters ("7AsPlQd" and "xAsPlQd12" do not work)

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Update: Oct 2020: I can now auto copy with 10 or fewer (was 9 or fewer before)