Personal hotspot is a good, but unrecognized feature. Basically, it turns your iPhone into a wireless router, so that others can connect and use your 3G signal.
It is not very good. Personal hotspot eats all of your data, even if you have 'unlimited' internet (500MB), it is slow, and drops out quite often. Another thing is, it isnt free; you have to purchase a bolt on for contract sims.
I never use it and never will; it also eats your battery like crazy.
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