Hello frnds I have a AIRCEL sim it have a weak signal strength and have low signal for internet. It affects internet speed data so but its call rate is too low compare than other company so it is best in call rates in whole india. I can preffer only for the call rates not for internet uses and it has no signal and no speed on every situation but in old keypad handsets like nokia, samsung java etc.it is best for them so you can buy this who have a keypad handset. But it gives low quality offer for internet but internet speed is the matter.