Take a look at the popular paid ones such as alertra.com , siteuptime.com, hyperspin.com and so on.
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I know there are a lot of others but Alertra has always been great for us so no reason to mess with success.
(And they have about every messaging option you can imagine)
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Alertra is the most reliable, in my opinion. They also have the "biggest" brand name, so you would like to think (even if it is faulty logic) that their service is better.
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I find 2 that suits my needs. Alertra and Hostracker. I tested them on
SMS side and Alertra's text message came in smoothly and fast while I
wait a while from Hosttracker test text. In fact, I have to hit "resend the
code" button for it to come.
Features-wise Alertra is on top. Hostracker on the other side seems
good on pricing or cost-wise. Hostracker does the same thing I want as
Alertra does but at much lesser cost. Had the text message came as
fast as Alertra, I am convinced.