The prices to Bangladesh have been reduced a lot recently by giffgaff and are now these prices which are actually cheaper than calling the UK?
The new international prices can be found here http://giffgaff.com/index/international
|Landline (charged in per minute increments)||4p|
|Mobile (charged in per minute increments)||4p|
|Picture Messages (MMS)||24p|
Use sim card ftom local shop
You might want to suggest a particular sim card my local shop does several small networks on the same scale as giffgaff but also Vodafone, Orange, O2 etc etc.