HT4993 Dear Sir or Madam

Dear Sir or Madam

I think I met some trouble, I bought from sprint iphone5, but it is as I came to China to use the local operators when it doesn't work, this has brought a lot of problems for my work, I know iPhone5 is a global mobile phone, but I was in China find it can not work, I think you can help me solve the problem. Thank you.