Try 1
Go To Cydia Installer In Ur Iphone Search For An App Named Mobile Terminal
From Sources
What is Mobile Terminal?
Ans : It is Command Prompt For Ur Iphone
a) Install terminal from Cydia
b) Type The Below Command
yellowsn0w -s
--> The Above Command Will Close It Now Type
yellowsn0w -q
Now Immediately Remove the sim card And Insert it After One Minute
Wait For Another One Minute U Get Signal
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