The most common cause why you are facing iPhone no service after jailbreak 6.1.3/5.1.1/ 7 is incorrect Baseband.
No Service error can only be resolved by downgrading your current iPad baseband. Most people jailbreak their iPhone with Redsn0w and upgrade to iPad baseband. And then they use UltraSn0w to activate their service, but fails.
The iPad baseband causes conflict with network service and interferes with radio Frequency of the device. To successfully get service on your iPhone ,follow the procedure explained below.
See also-5 Ways To Fix iPhone 4/5/6 No Service Problem

How to fix iPhone No Service After Jailbreak
- First Download the latest version of RedSn0w
- Download your Firmware here (6.0.1)
- After you have downloaded RedSn0w, Extract and Open it as administrator
- When Redsn0w is opened, navigate to extra and ‘select ISPW’ and browse for the firmware you just downloaded

- After the process is completed, kernels and Ram had been added. A screen with options will appear.
Visit our Apple Troubleshooting guides
Check to see if you have the iPad BaseBand downgraded:
- Navigate to Settings>general> about
- Check Install Cydia and downgrade From IPad Baseband.

- After that, your iPhone will reboot
- Launch Cydia on your iPhone

- Click on Manage tab at the bottom right

- Select Launch Source
You may read- Jailbreak And Unlock IPhone 3GS 4.1 Baseband 05. 14. 02
- To fix iPhone No Service After Jailbreak –click add at the top left and type http://repo666.ultrasn0w.com/ as the source URL and press the Add Source button.

- Select Return to Cydia
- Select Done at the top right
- Click http://repo666.ultrasn0w.com/ from the source list
- Install and confirm to fix iPhone No Service After Jailbreak
- The final step is to restart Spring board and now you can place your SIM card within your iPhone 4/3Gs/4s/5/3 and you shall get Service.
If this method did not solve the service error after you have jailbroken your phone and downgraded your iPad baseband,then try this one. Be sure to back up all data by iCloud or computer.
Insert your SIM card that is receiving no service error and head over to Settings > General > Reset > Reset Network Settings.
You should also read –How to fix Iphone stuck on slide for emergency and connect to iTunes screen.
when it fix can you upgrade your iphone back to 7.1.2
thanks it worked though i only installed that app from repo after i jailbroke my mobile didn’t follow other steps though still thanks alot !
my wi-fi on my iphone 3gs dose not work. is there another solution with the packeges? help please!!!
Hello! Does this work on iphone 4 version 7.1.2??
Reply ASAP please
Thank you
Yes it does with the same 6.0.1 firmaware
Chevy I have a Galaxy note 3 t mobile it says not registered on network…called t mobile and the imei has been blocked by them..is it possible to change the imei number? If so how do I go about it….Thanks
Hello! Does this work on iphone 4 version 7.1.2??
Reply ASAP please
Thank you
Yes it does with the same 6.0.1 firmaware
Chevy I have a Galaxy note 3 t mobile it says not registered on network…called t mobile and the imei has been blocked by them..is it possible to change the imei number? If so how do I go about it….Thanks
Hello! Does this work with 3G? I need a response asap. 🙁 Thank you!
Yes
Hello! Does this work with 3G? I need a response asap. 🙁 Thank you!
Yes
thanks for this very helpful tutorial… cheers!!
thanks for this very helpful tutorial… cheers!!
I Did This Total steps bt still prblm is there when switch off and on my mobile then it will shows similar message NO SERVICE. Is there any permanent solution for this one pls help me
I Did This Total steps bt still prblm is there when switch off and on my mobile then it will shows similar message NO SERVICE. Is there any permanent solution for this one pls help me
does this work with 3g?
does this work with 3g?
Very vry thnq So much Dear .. i hv done.. Network is workng done…!!!!!!
Very vry thnq So much Dear .. i hv done.. Network is workng done…!!!!!!
can it be done without using wifi
can it be done without using wifi