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1.5gb will vary with how you use your mobile device. Videos, photos, and large attachments will consume it more. Emails will not.
You might want to start with something that you feel comfortable with and then look at your consumption daily, weekly and finally monthly. After a while you will know which plan is best.
So i have 500mb and i went over that like 503mb not much but i send pictures via text look things up on line etc when at home use wifi and turn data off lol and use wifi whenever i can when i am out but is 1.5 gb like almost 2 gigs??