I will shortly (hopefully) semi retire, which will enable me to increase my time on the water SUPping, windsurfing etc. Unfortunately I will still be on-call. I need a way of receiving messages while I am on the water to let me know whether I need to rush to land due to an emergency or if I have an hour or so before I need to come in.I am looking for a waterproof watch I can wear that support 4G so I can put a cheap SIM card in it. Then if people need me they can text me a messages letting me know how urgent the problem is etc...I see various models on EBAY and elsewhere, but was wondering if any of you had any experience with them.Ideally the watch would vibrate as well as ring when I receive a message. It doesn't have to work as a proper phone but that would be a bonus.Looking forward to your comments.regards Tony.