Bhutan Telecom is promoting its new Power Voucher: 50 minutes of talk-time for Nu 60, which is Nu 1.2 per minute. Is this a good deal? Quite probably, unless you're calling during late-night hours (1-3AM), when the charge is Nu 0.4 per minute. But there are a few missing details regarding this offer: Is the money being deducted in 15 sec units, or by the minute? And which balance is debited when your phone has both a regular balance and a "power voucher" balance? Hopefully BT will provide more details and list the exact terms of this new voucher.
Update: This voucher can only be used to call another B-Mobile subscriber. You will not be able to use it to call TashiCell subscribers (Thanks, Andrea).