Phone,
I think the comment about BRS and envelopes is accurate to some extent but it does not disguise the fact that long standing BRS customers in Nigeria are writing tenders that they know only BRS can accommodate. Precisely where that falls under FCPA and other Anti Bribery legislation is unclear but it does smell a bit when operators write a tender they know only 1 party can respond to. Why would they do that? I doubt they'd get a good rate if only 1 party replies. Maybe there's something else at play?