SMS? Is it still exist? As far as I know, SMS is a pretty spammy thing, which only disturbs people, but not actually gives a positive result. Personally, if someone wants to promote marketing, I think it's best to work with SEO agencies since people that work there have a lot of experience in digital marketing area. With that kind of experience u can raise the ranking of the website pretty high. Personally, I've worked with
SEO Manchester agency. These guys know-how marketing works and btw they have pretty nice webmaster tools that allow them to be a lot more effective than the ordinary agencies.