According to a well informed staff in one of the GSM companies there will be a tariff increase on data on all networks starting from first december. Read his post below;
"i can reliably inform you that data rate will go up 1st December,2016. NCC has mandated all GSM Companies to raise data rates. This is sad, Nigerians should not accept it, Nigerian Government through its agencies should not make life harder for Nigerians! N1000 Will be 500MB from December 1st 2016."