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Hi @davidrossiter,
It has been a while since I've used an iPhone, but from a bit of a google search I recommend you try the below tip.
To hide it, slide your finger down from above the text-entry box and the keyboard will start to disappear. Carry on until only the text-entry box is left. To make the keyboard reappear, tap the text-entry box and it will shoot right back up so text can be entered again.
Regards,
Karl