Can I lower My Current Iphone Data plan to a Cheaper One?

I'm on the share plan, only one I could choose. With I got unlimited everything except data, so I picked the 4gb thinking I would use a lot of it, I notice I hardly use that much at all. So is there anyway I can lower to the 2gb without disrupting anything on the contract? If I can change it, will it effect getting the down payment back when I pay a full year without missing any payments? Also If I can change it, How do I go about doing it? Can I do it on computer(preferred way) or does it HAVE to be by phone?

I'm on the share plan, only one I could choose. With I got unlimited everything except data, so I picked the 4gb thinking I would use a lot of it, I notice I hardly use that much at all. So is there anyway I can lower to the 2gb without disrupting anything on the contract?
--- yes… Account plans and features ahve nothing to do with a contract. Contract means you got a $599+ phone for discount price ($199 or less). Change your voice plan or text plan or data plan every day if you want.lmao

If I can change it, will it effect getting the down payment back when I pay a full year without missing any payments?
--- no. The only thing that effects the deposit is if you get suspended OR canceled due to non-pay of a 1 bill… Get suspend or canceled just once in the first year---kiss your deposit goodbye!

Also If I can change it, How do I go about doing it?
--- do it online at your carrier's website like MyATT or MyVerizon or MySprint… Or call them up… Or see the nearest carrier store

Can I do it on computer(preferred way) or does it HAVE to be by phone?
---see above

A simple Data plan can be had for around $30 which is far cheaper. You will get a good number of calls and text messages in these plans which will suit your needs since accessing internet will be left to Wi-Fi.

More you got here: http://mobilerookie.com/using-iphone-without-data-plans/