Thread: Without sim wlan channel 13 can't be used?
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AapoRantalainen is offline AapoRantalainen
2014-05-31 , 14:03
Posts: 839 | Thanked: 3,386 times | Joined on Mar 2009
#1
What are wireless channels that N900 can handle? And most important what affects to it?

On 1st device I can do
Code:
iwconfig wlan0 channel 13
(channels 1..13 work)

My 2nd device can't do even
Code:
iwconfig wlan0 channel 12
(channels 1..11 work)

Error message is:
Code:
Error for wireless request "Set Frequency" (8B04) :
    SET failed on device wlan0 ; Invalid argument.
After thinking I realised that device#1 had sim-card and device#2 didn't. I swapped sim-card from #1 to #2 and then device#1 can't use channel 12 and 13, but device#2 can.

What's happening? How I can control this?

---
I tested with old (disabled) sim-card and it didn't give me access to the wlan channel 13.

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My theory: Channels 12 and 13 (and 14) are illegal at some places (North America?) and I must somehow proof that I'm currently in Europa. And gsm is used for that purpose.
[ https://en.wikipedia.org/wiki/List_of_WLAN_channels].
 

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