Blocking my own phone number on iPhone?

I want to send a text to someone (it's a surprise text not a mean one) but I don't want them to know its me, how do I hide my own phone number so they can't see it's me when they receive the text? I have te iPhone 4s

I'm pretty sure you can't block your number when sending a text message, you can only block it when calling them. Sorry.

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