IMing + dataplan

so currently my data plan consists of 1MB (1024KB) and 400 texts. i have a blackjackand i started using oz messenger but heard it charges data as well as your texts. if i were to switch to an AIM that uses solely data no texts, roughly how much does that use up in data. in other words how big is your typical Instant message on an AIM client in kbs on a smartphone, as well as loading buddy list on sign on, etc. if i have only 1MB per month and i use it only for this, no web surfing, would i be able to survive on very very lightweight IMing? thanks in advance.

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sweet thanks