Brady, Yeah it sucks being on call all the time doesn't it, people just don't get that it is a requirement of your employment.
I use to be an electrician (1 of 2) responsible for a power station and all electrical services on a tourist Island surrounded by surf. I was on call every second week for years and had to carry the on call phone, the Power Station pager and an emergency services pager.
I would get some strange looks (and often comments) walking around on the weekend in my boardies with all that electronics hanging off me.
At times I would talk my son into coming out to the beach with me, to sit and mind the phone and pagers, if I was required he would hang my towel over the railing so I would see it and catch the next wave in.
At other times I would just use a waterproof pouch (like one in one of the links above) around my neck and tucked into my wettie/rashie and it did the trick.
I was always nervous heading back to the settlement after a late sunset session praying that the lights would still be on.
You can also now get waterproof phones, a mate that is an instructor has one, I don't think I would trust its waterproofing for kiting but combined with a waterproof bag it may be the answer.
store.m8sr8s.com.au/index.php?main_page=product_info&products_id=323