Please dont use tatadocomo sim/service...the worst worst netwrok...call drops every no and then, I initially thought My Iphone is the culprit later I changed to simple phone, But call drops even more. I realized Iphone was actually trying to improve the signal.
My important clients are very furious about my call drops. I cant blame anyone..because it was my decision to buy TATA DOCOMO but I severely regret. Now I wish to switch to either reliance or Airtel. .PAY more but dont loose ur calls.