Isn't labeling any new plan as "promotional" standard for BSNL announcements? I seem to remember this being the case for them, including region specific plans (like those being given only in AP etc.).
The way I understand it is that all new plans are "promotional", for a period of 90 days, I guess in order to fulfill some type of feasibility requirement. After this period they either make the plans permanent, or keep extending the promotional period.
Does anyone know of any case where BSNL introduced a plan for a limited period only, something like a few months, and then removed it?