TS1398 I have wifi problem with WiMax router.

I tied to do all of ways. but it was useless to me using wimax rounter.
When other iOS version of iPhones & other android phones connect to my WiMax rounter, speed of download is average 6Mbps. Speed of upload is average 4Mbps.
but when my iPhone5 using iOS6.1b4(sure, I tired to test on iOS6.0.2) connects to the router, speed of download is average 0.3Mbps, speed of upload is average 1Mbps. sometime speed of download is 4Mbps, speed of upload is 2Mbps... what can i do??

Back up all data.
Launch the Keychain Access application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Keychain Access in the icon grid.
Select the login keychain from the list on the left side of the Keychain Access window. If your default keychain has a different name, select that.
If the lock icon in the top left corner of the window shows that the keychain is locked, click to unlock it. You'll be prompted for the keychain password, which is the same as your login password, unless you've changed it.
Right-click or control-click the login entry in the list. From the menu that pops up, select Change Settings for Keychain "login". In the sheet that opens, uncheck both boxes, if not already unchecked.
From the menu bar, select
Keychain Access ▹ Preferences ▹ First Aid
If the box marked Keep login keychain unlocked is not checked, check it.
Select
Keychain Access ▹ Keychain First Aid
from the menu bar and repair the keychain. Quit Keychain Access.

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