iPhone 4.0 WiFi issues

[Neepawa]

Will wifi work on 4.0 if I choose "802.11n+g" ?

It should, as long as you use a 20 MHz bandwidth. If you use a 40 MHz bandwidth it probably won't. You should be able to configure this under the 802.11n wireless options on your router.

My brother has a very old mac, so the b+g won't work with his iBook which only does 802.11n.

This is very unlikely for a couple reasons. First, 802.11n is the newest standard, so older hardware is very unlikely to support it in place of the older standards. Second, this is in fact prohibited in the 802.11n standard; all 802.11n devices must also support 802.11b and 802.11g at 2.4 GHz and 802.11a at 5 GHz.

Hopefully that helps.

 

[-aggie-]

I'm not sure why posters are acting like this dual band issue is a new thing. It's been a problem for the 3G's and 3GS's as well (I would suppose for the original too).

 

[Neepawa]

I'm not sure why posters are acting like this dual band issue is a new thing.

It's a new thing to me because my 3GS worked fine with my router with OS 3.1.3, but stopped working when I upgraded to OS 4.0. Once I switched to 20 MHz bandwidth, it worked again.

 

[Neepawa]

I don't know about Beta 2, but I can confirm that this has been fixed in Beta 3.

 

[iYellow]

Got wifi fixed, but what about all the crashing? If I try to open photos there is a blank screen every so often. And the phone reboots a lot