I'm looking for an external zoom function for a cell phone. This would give a alternative to the pinch zoom or the volume keys. Attached is a picture of a zoom function for a camera but it doesn't have the same ports as a cell phone. I was thinking finding one for the earphone jack or the charging port would be hard to come by so I was thinking Bluetooth would be easier but I'm just looking for whatever i can get. Who knows maybe I'm a little crazy. If you know someone or you know of it or you can redirect me to somewhere, anything will help!

Ps I'm not looking for a lens to go over the cell phone camera

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