Aircel Gprs APN problem on Nokia 2700 classic

Hello , I am using Nokia 2700 classic with Aircel connection but whenever i m trying to access internet on my mobile then it's showing error that I have some configuration problem. Kindly help me what should I do to solve this problem.

Earlier my net was working properly through this phone but now its not. I am not sure what I have done. I had changed sim but old sim was also aircel . I don't think it should give problem because for Aircel sim , always settings should be same.

What is exact APN for aircel gprs ?

I am also having same problem and can't connect internet but I have balance and I think settings are right too. Did you get it solved .. how please help me too to solve it.