I just buyed reliance GSM sim for my internet usages and I was also satisfied or a initial period of time as speed was OK and it didn’t lost network too.
But after few days I started facing a major problem of losing speed or network very frequently. it showed the signs of slow speed and call drop too. since I had a prepaid account therefore I didn’t had any billing issues. But once when I get it recharged it get did in 4 days the worst experience ever.