Firstly we are take a new phone then we are ask our friend opinion foe take a sim. my friends assk some times then I am said the opinion A good sim is Airtel.
because The$g firstly introduce iin this company.and other brand operating system than high speed provided in this brand.
Indians most high speed network is Airtel .
good offeres are give.
and mainly I am said in this sim mobile network some time is slowly but it is normal