I have experience with telenor service.it is worst about its signal and range, but its good in call rates.
Telenor mobile oprator is provide cheap'st call rates and also provide sms packs , data packs, it provide 2g data.
Sometimes in village telenor signal is lost but its good in city. Am using telenor for calling I recharge 69rs everytime in this pack 6000 local and 69000 TtoT seconds.