Steam Guard doesn't want to send me the SMS to activate it in my mobile device

[Pintassilgo Paredes]

I'll explain it better here : I've downloaded the Steam App and so I decided to add the Steam Guard to my cellphone for the two steps verification stuff, but also when I add my phone number, the Steam doesn't send me one and so I can't activate it, and for instance I'm not being able to sell some of my items because it takes too long for steam legalize it in the market.
I hope you guys understood everything that I said, it's because I'm not fluent in English.

[Hexagon]

Maybe you need to put prefix like +44

[Pintassilgo Paredes]

İlk olarak Danon tarafından gönderildi:

Maybe you need to put prefix like +44

But that's the problem, I put it exactly as it says. I thought it was a problem with my phone company but I can receive messages from anyone.

[Hexagon]

Hmm well looks like I'm dumber than your issue lol. Contact steam support maybe they might help

[Pintassilgo Paredes]

İlk olarak Danon tarafından gönderildi:

Hmm well looks like I'm dumber than your issue lol. Contact steam support maybe they might help

I tried but there are no topics that match with my problem, I don't know if there's any form for me to contact them by writing a letter or something. And it looks like I'm the only person to have this issue.