I'd seriously NOT consider downloading anything from that site let alone submitting your phone number by texting them. There is service charges and a daily charge involved so it could potentially cost you a lot of $ That is a scam there is plenty of places to get the ISO where you dont have to submit your mobile number and get charged to hell for downloading some thing.
I'm surprised by an obtuse and discriminatory attitude of some (guys) that the "old" feel superior and privileged ... absurd and intolerant idea .. It would be before the judge, at least try if the contribution is worth or not ..
I rather think its more common sense not to submit a text to a dubious source that promises to let you download the ISO. You can be sure there will be service charges from this as well as being charged daily to use this - plus who knows any other hidden surprises.