This study documents and measures the information and persuasive contents of MTN and GLO magazine advertising contents. It examines the extent to which MTN and GLO devote their advertisements to building their corporate identity; find out the extent to which GLO and MTN advertising contents reinforce consumers buying decision. The method used was content analysis. Two independent magazines, The Tell and The News magazine, being among the leading news magazines in Nigeria were purposively sampled for the study. The study was delimited to a period of three months (January to March, 2010). The study revealed that MTN and GLO advertisements had more Informative and persuasive contents. However, in comparative terms, while GLO advertisements tend to be more Informative than MTN advertisements, the latter seems to be more persuasive than the former. The study also revealed that while news headlines dominated both MTN and GLO advertisements, question headlines were the most seldom used. It was recommended that MTN and GLO should carry advertorials that would reflect their opinion on social, political and economic issues in Nigeria. This will show their commitments to the general well being of Nigerians.