On the first link the service encrypt the incoming sms untill you pay for it. The second one dont create new phone numbers and existing ones are already taken or even blocked (typical problem of most of the websites). Same thing with the third link but there for some reason not all numbers are valid. Gona try the application, gona be surprised if it will work
I recommend you to use
smspva.comI have used them multiple times with Telegram and Steam. It worked well all the times and the price is as cheap as $0.1 or $0.05 depending on the service you want to activate with SMS.
My problem is that i can only pay with skrill and dont have the access to most of the popular systems