What's the font written SIM?

Fortuna Dot  Suggested by rocamaco 

Thanks a lot, Rocamaco

Não há de quê...

"M" is different though

UPDATE: "M" could be a crappy adaptation using two "I"s and other letter for the middle part or even hand made

But still, the "S" looks different too, doesn't it ?

don't know if it's only me, but their (FB) previews look quite distorted Some dots are a little bit different though, yes.