Idea is very popular and big company all over.
India's 75% peoples used idea sim .but reason fir dislike is plans are not good and postpaid sim cards have plan is 199 and bill is 300-350.this bill is without used or daily one call or sms.
Peoples only used idea sim for range not used for offers and plans.
According to me only used for incoming beacause plans are so expensive and don't buy postpaid cards, in case you buy postpaid sim used 3months and convert to other company.
And enjoy