i could be wrong, but some of the central african countrys make it difficult to get sim cards....so could be one reason he was not in contact....and using the card to the max everyday would not be too unusual as the limit is normaly prity small....if he is in yaounde, its possable we is trying to get the gabon or congo visa..worth asking there in there embassys ( but i would not expect them to be too friendly, but if speaking french maybe)
i hope he is ok....do you have records of him arriving in cameroon....nigeria is a tought place...easy to get lost there...
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