I got attracted to a particular phone, made in China. It's just too cheap, talking about the features on it. But on the package, they wrote,

Note: This GSM phone operates on the 900 and 1800 MHz bands. Before you buy this item, please make sure that your country uses one of these two GSM bands.

I want to be certain that the phone would work here in Nigeria. Please can any one tell me about the bands on which Nigerian GSM service providers like Glo, MTN and Zain are operating? Is any of these operators in 900 or 1800 MHz band? If yes, which of them.

Please I need your response