No registration in the net (galaxy s5 g900f) - Galaxy S 5 Q&A, Help & Troubleshooting

hello people, my phone galaxy s5 g900f, is presenting the following problem, it recognizes the carrier chip that I use, however does not make or receive calls and when I look in the following message: "there is no record on the network" can anyone help me ? Does anyone have the original room of his factory?

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[Q] Samsung Galaxy s4 i9515 IMEI certificate fail...............!

hi to all
sir i have a samsung i9515 value edition
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Samsung I9515 cert fail
Same Problem here bro ??
Any solution please ?
According to the speculation in this thread this is related to the phone's region lock. Are you able to make calls?

Samsung Galaxy S4 I9500 E330K

Hey Guys i need some help as i am really confused with this korean S4 I9500 E330K
i am from Tanzania and when i put a Simcard in the phone the networks seems to be on 2G i don get it while same simcard on ther goes to H or 3G.
secondly i am unable to run some important USSD codes Eg. *150*00# or *149*01# these are menu for subcribing to packages non of them work , i did alot of searching din come up with anything.
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Galaxy Grand Prime Secure fail: Kernel

I attempted to update my samsung galaxy grand prime (cricket mobile) to android version 5.1 with samsung kies. After doing so the device successfully booted into android lollipop, however i experienced major lag while using the device. I powered the device down and restarted it to find that I was faced with this message
Security Error: This phone has been flashed with unauthorized software & is locked please call your mobile operator for additional support. Please note that repair/return for this issue may have additional cost.
I am not very experienced in phone modification so if anyone could help me out it would be highly appreciated
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