Just noticed a price reduction in the M&M price plans so I'm considering replacing my old Nokia 3120 that I've had since....well...forever!

I'm having a personal battle with choosing either the N95/c902...but I'll resolve that soon enough...my main enquiry is how the Live Messenger works without purchasing any additional minutes.

I plan on using only the M&M 300 which I'm sure I'll maybe scrape in using. Will I be able to stay on Live Messenger (MSN) constantly and it won't effect my monthly billing in the slightest? (Never had a contract phone before...used Pay as you go only)