Have you tried using email notifications? It still works. When funds come into my watch-only address, they send a notification to my email address and my phone notifies my of a new email. I use a different notification sound for emails from blockchain.info on my phone, so I immediately know it's bitcoin into my address.
I did not, my office closes email ports to external servers, so does me no good. I get cell coverage there, but no data unless I'm by the window. So no MMS or Email, only SMS. Might be able to craft an Email to SMS rule though.
In any case they said it didn't work, so I stopped all efforts. I would like to prove them wrong. I have a payment coming in Sunday, so I'll let you know if it works.
Thx