Not suggesting this applies to you, but telecom fraud is a huge problem. Skyetel does what they believe is prudent to assure they don't get burned. Have you tried calling their support folks? They can be very helpful sometimes.
Well that is what I understand to be the issue for their industry. As they have a lot of calling fraud and I understand they need a way to differentiate people, but you also got to look at it from a single person with very small needs. They are essentially saying "Purchase cellular service from one of our listed companies or we do not do business with you", and that has nothing to do with security. It has to do with the fact that the security company owns part of the SMS company and/or they have a legal contract with the company.
I've run into this before with Bria. They would not accept a T-mobile number as a mobile number and required me to send birth certificate, drivers license, utility records... I am not joking either! I felt violated by their request and shocked that with all their intelligent security people they couldn't come up with a better solution other than to request enough info from someone to basically steal their identity.
Basically, I refuse to do business with companies that get locked into the SMS security racket, because it is a racket.
I can do business with other companies and none of them require the level of identification that they do, so I have serious doubts about their own internal ability to keep my information safe, let alone their own.
But thank you for the advice, I will try to contact them through the regular voice channels. I may even consider grabbing a pay-go number just to make them happy, I am sure that net10 might be one of the companies on their security kick back list.