I had used Docomo sim for almost 2-3 months they really fed me up. It was very worst experience with Docomo.
1) if you are living in rural areas then you don't even think about to buy Docomo sim.
2) I used prepaid network and their plans are expensive as we compare with airtel.
3) Docomo's network is very weak. And in that cases you can't hear clear on phone when you talk to someone.
4) my internet speed was very low. I was getting only 100-150 kbps download speed. As compared other network now airtel gives me almost 1mbps download speed. And airtel's network is very good compare to Docomo.
5) data rate was expensive. Now I get on airtel 70Gb data for just 244 on special offer.
Now I switch my sim to other network. Because of bad networking, and bad customer care service, and internet speed.