One does not often see mobile subscriptions decline in any developing country market, in any particular quarter or month, but that seems to be what happened in India in May 2016, when total mobile subscriptions dropped about one percent.
In urban areas, mobile subscriptions dropped two percent. In rural areas, subscriptions grew.
But most of the dip comes from share losses by several mobile providers, not necessarily an across the board decline in net subscribers for most mobile service providers.
Fixed voice subscriptions also dropped, but that is not entirely unexpected in many markets.