How to check my iPhone for spyware?

I’m wondering how to check my phone for spyware. I was talking by text to someone who sent a “photo” but it showed up as a file…I touched it to download…no picture ever opened. With a little more time and conversation I became aware this person was not trustworthy. Iam concerned that that file was not a picture…id like to be sure there isn’t any spyware on my phone. Please advise on the best way to address this concern?

[Re-Titled by Moderator]