[Q]I9500 sim card not registered on network topic

Hello experts,

I am facing horrible issue on my Galaxy S4 (i9500).

Currently the phone can detect SIM card but won't register on network.

IMEI: normal
Baseband : normal
ROM : just flashed samsung official rom
EFS : already back up

Have tried several baseband to revive, but cannot

Screenshots attached, any one can help me? thanks

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[Q] not registered on network topic

I flash stock rom and my sim stop working and imei changed..my mobile is rooted with philz recovery plese help me out..screen shorts of baseband,firmware and incorrect imei are given.currently i am in pakistan.and mobile comes from england

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Samsung i9300 not registered on network after update topic

I bought a used factory network unlocked S3 i9300

it had 4.1 , i downloaded 4.3 from Samsung-updates.com and i flashed the stock recovery and stock firmware using odin (i downloaded the first one "GT-I9300 NZC I9300XXUGNJ2" (i think because my phone is not tied to any network operator i cold choose any firmware)
i followed this guide http://forum.xda-developers.com/gala...overy-t2323847

every thing went smooth and good now i have android 4.3 but the problem is that when i call a number i get not registered on network
i'am confused why is this happening ?
i had seen some pages on the web that say root the device and install custom recovery then flash a modem file...
i dont want to root my s3 , and why the hell it is not working and i'am using Samsung stock firmware why do i have to flash a 3rd party stuff to make calls working !!!
note: the IME after update is correct