This is really easy to set up and you get a free credit allowance. They're also recommended by Sucuri. I gave this a 4-star rating because you're reliant on having either a mobile phone or a land-line phone handy, which is both a strength and a weakness. I would like to see another option for people who haven't got their phone or can't use one for some reason. That would earn a 5-star rating.
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