Tata Docomo is company provides best offers and nice call rates but there is big problem of network and it has no 4G network coverage and in cities there is best network but in villages and out side the cities there is network problem and in our village there is no network of 2G also and its 3G also slow I used this sim 1year and I never seen seed above 800kb/s but other companies 3G speed now it is 4G generation so Docomo must upgrade there network but in offers reason people are using this