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How to fix some mysterious problems.

well i don't know why my iphone 3gs won't work or what i did wrong but i have the newest version ios 5.0.1 BB 6.15 used redsnow and downloaded cydia and ipad baseband(for 6.15) then i installed ultrasn0w after it finished downloading it said "could not activate cellular network" then now everytime i put in my T-Mobile sim card on the top left corner "invalid sim" pops up and right after that sim failure pops up for 1 second then just goes away and it just says no service right away . so how do i make it so i am able to use t-mobile carrier on the iphone.

Did you reboot after installing ultrasn0w? and is 3g turned off in settings>general>network?


answered 12 Nov '11, 01:16

theiphoneguy's gravatar image

theiphoneguy ♦

i didnt think that ultrasnow had been updated to work on 5.0.1?

(12 Nov '11, 01:17) therealcmac therealcmac's gravatar image

hmm didnt think of that but sometimes no update is needed

(12 Nov '11, 01:20) theiphoneguy ♦ theiphoneguy's gravatar image

this is from the redsnow blog, not sure how to interpret it though "For those 3GS and i4 users who preserve their baseband, the Mac version can also produce the NO_BB_* custom IPSWs for 5.0.1. (But please note that ultrasn0w doesn’t get updated for betas like this.)"

(12 Nov '11, 01:28) therealcmac therealcmac's gravatar image

hmm, someone twitter MN and ask ;)

(12 Nov '11, 01:30) theiphoneguy ♦ theiphoneguy's gravatar image

yea i reboot and turn it off 3g but and idk if ultrasn0w works for 5.0.1 but i was able to install it

(12 Nov '11, 01:43) iphonefury iphonefury's gravatar image

Usualy the couldn't activate cellular netowrk means that communications error occured between the baseband and the iOS and this could be caused by a hardware damage on the baseband. What i would suggest you do is to test your iPhone at a lower iOS version such as 4.3.3 (requires you have the correct SHSH) and see if the SIM card is recognized and works well, if it doesn't then your iPhone baseband is bricked.


answered 12 Nov '11, 03:46

knightz4u's gravatar image


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Asked: 12 Nov '11, 01:13

Seen: 21,584 times

Last updated: 12 Nov '11, 03:46

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