I use
www.abdcphonecard.com
They do not deduct any minutes and you can track all call records online real time.
You have to open accounts online and the PIN number is fixed.
You have to rechagre account when you finish your account balance.
Recharge amounts are $5, $10, $15, $25, $50 and $100.
Sample Call Rates for $5 are:
Dhaka (land): 100 minutes
Chittagong (land): 100 minutes
Mobile: 70 minutes
Rest of Bangladesh: 52 minutes
Connection is readily available and call quality is good.
I found this site in Prothom-Alo/Ittefaq online ad 6 months ago and have been using this service since then.