The LTV will play an important factor in your intention to have the MI removed.
In my understanding, you need 20 percent at least before you can request for removal.
However, not sure about the exact date of implementation this year, all MI on FHA loans will be carried for the life of the loan.
Read your loan documents as mentioned by some of the members here. And contact your lender. Lender will not removed it unless you get involved.
Best of Luck.