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Working great on my 4.1 JB. No issues at all. Never used any other programs but this one came frequently recommended so I figured I'd give it a try. Glad I did.
 
I've been a long term MyWi user on my iPhone 3GS and on my current iPhone 4. However, after my recent upgrade to iOS 4.1, MyWi isn't working for beans. My computer can't get an IP address.. Really frustrating. If I do official tethering over bluetooth, it works, but MyWi isn't working...
 
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