Low cost Android Samsung phone needed for clear voice conversations & could be also used for high speed tethering/connecting to Laptop/PC i.e. using as 3G modem.Which low-cost phone can be used for clear voice delivery for 'Viber' & 'Whats app'. Basically, low-end Choices are Samsung Pocket Plus S5301 Vs Samsung Y Vs Samsung Ace

Also need to use 'Skype' in the same handset with voice & video clarity