Provided Email notification service from bitsuperlab for delegate missing blocks, we now further suggest a more variant solution based on that service, supporting more channels.
https://bitsharestalk.org/index.php?topic=6324.msg84376#msg84376

https://ifttt.com have a free recipe for user to create logic like:
if
Gmail
then
SMS

I would like to use phone call, but unfortunately they only support US phone numbers, but SMS is also good choice for me:)

They have a lot of other channels you can use. Here I shared a recipe template that you can directly use it.
https://ifttt.com/recipes/198875-bitsuperlab-sms-degate-notify

Donate to btsx account "bitsuperlab" if you like it :)