The white 3pole jack that came with my tentacles seems to be faulty. Initially I thought it was my iPhone however I get connection issues with my iPad Mini as well.
Before I try to get a new cable have there been any known issues with the latest iOS update?
I wouldn’t suspect the cable that soon.
You can measure the cable with a simple multimeter.
But do you have the right cable? You need the 4 pin mini jack to connect the Tentacle to the iPhone. Not the 3 pin.