I dont know how BIS is working in other countries but in my country there isnt much benefit from it. Yes, you can have unlimited bbm messages but there is no unlimited data per se. With BIS data plan we get some free MB and that is it. You must relly on compression mostly. BIS is also a drag with service books and aditional fuss with developers...
Before anything, BBRY should work on internal functionallity, improve API, and implement all legacy BBOS features. On business side of story, I guess they have to choose will they sell phones to corporate and give BES10 for free or they shall sell BES10 to corporate and give phones for small fee. Selling both seems unrealistic
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