Have you considered investing one time for one Mobile phone and using internet for being connected and spending very low for communication?
This is best of those who have more people around having scope to use a bit high end mobile in which skype can be installed.
If you are using skype in your mobile…please do let me know…would like to discuss about it for my research. If you are not using, follow this blog. Might be able convince you.
In which mobile phones can we install skype?
Visit : http://shop.skype.com/phones/
What is the easiest way to download skype in mobile?
A free SMS will be sent to you ! Follow that enough! Visit: http://www.skype.com/intl/en/get-skype/on-your-mobile/download/
For Mobile Phones in Bangladesh, you might want to visit:
Biggest Screen among Nokia Phones which is feasible for me: