How to block a number on an iPhone 4S? - 1

I don't have IOs 7
I don't have Wi-Fi
I don't have a laptop
I use tmobile Internet on my iPhone

How can I download io7 to block people?

IOS 7 can be downloaded in "Settings"
Regarding blocking numbers, you'll probably have to speak to your phone provider about that, or have a rummage around in Settings and see what you can do, or save the number under something like "Don't answer" or "Telemarketer" you'll also know if its the same person/company calling each time if you do that