I have a general mobile broadband usage query.

I was thinking the other day to run a messenger - either msn live or gtalk or something which can do these and more on a windows mob based phone.

I want to know 1) which messenger s available are pretty good / reliable and tested

2) if i plan to leave them running all time, will it consume a lot of data??

 I may receive something like 10-15 txts and prolly reply same number. This is the MAX estimate.

Any other con's i should be aware off - will it consume lot of resources like battery,etc.