Question for app developers......

There are a lot of people on these forums including myself that is stuck in the unlimited data package without being able to tether our phones to our computers for internet.
If someone could develop an app for this I feel it would be a great money maker because I would be willing to pay $10-$15 for an app that would allow me to do this as I'm sure others would too.
Is this possible to do? If so why hasn't anyone jumped on this yet?

Thanks

Even if the API's were available to do this from an App (I doubt they are available to developers) the app would have to get approved to be listed on the store. Hence why there are none for iOS through the official store, there are however if you jailbreak your iPhone. Since Android is a lot more open in terms of API and store, you will see apps for this on the Play store.