Question :

Is it possible to typ the ‘degree symbol’ ( the mini-version of the letter O or number 0 next to the top of a letter or number ) on your iPhone ? If so, how do I do that ?

Answer :

Yes, and doing so is rather straight forward – if you know where to look :
– on your iPhone (in iOS) open an app that you can use to typ texts (like Notes, Mail or Whatsapp)
– typ your text as usual until where you need the degree symbol
– then long-press the number 0 key and a popup will appear where you can select the degree symbol, just click it to insert

That’s it

enjoy 😉