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I use ad hoc network to transfer the data from iPhone to a laptop. I thought transfer speed would be more than 54Mbps, but it is only 11Mbps.I think 802.11b/g is used for ad hoc connection.

Is it possible that iPhone 4S connects to ad hoc with 802.11n?

I use Macbook pro mid-2009, and Network Unitility says link speed is 144Mbps.

It seem I can use 802.11n for ad hoc network...

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What channel is it using? Channels 1 to 11 are the slow ones. – GEdgar Jan 6 '13 at 1:16
Thanks Gedgar. I used channel 11. I tried Channel 36 40 44 48 but my iPhone could not find the ad hoc network with these channels... And, my MBP shows only these channels other than channel 1~11 – user37984 Jan 6 '13 at 9:44
The iPhone is region locked and will not let you connect to channels above 11 unless you're in the UK. Even then, only channels up to 14 exist in 802.11. Your 54Mpbs is the maximum link speed. Interference from other wireless equipment running in the same spectrum will degrade your link. If you're out in a flat desert with nobody around, you'll get the full link speed, but if you're in a suburban area, you're going to see it degraded - just quick lesson from wireless networking 101. – Andrew Larsson Jan 10 '13 at 17:10

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