[Q] sim unlocked in UK but locked for Malaysian sim - Galaxy S 4 Q&A, Help & Troubleshooting

Hye all
i recently purchased a samsung galaxy s4. I can confirm that it is unlocked for UK network however when i put my malaysian sim card in it asked for a sim network unlock code. Anyone here know how is this possible and is there any way that i can unlock this?
It is worth noting that on the box of the phone it says
European model.
this product is only compatible with SIM card issued from a mobile operator within Europe.
Please help me.
Thanks

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I've just got this phone wich was recently unlocked from TELCEL MEX carrier. The weird thing here is that the phone work flawlessly with any domestic carrier sim cards, but not with my US T-Mobile sim card.
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This may be relevant or not.
My previous phone was an HTC Desire S on O2UK.
O2UK give you a free unlock on all contract phones after 6 months and send a code by email to you.
Any time I tried changing sims to a different carrier it asked for the unlock code, except when it was Tesco Mobile UK.
It may be that the original carrier requires you to input the unlock code for anything other than certain providers.
I tried to get an unlock code for my I9505 LTE but they said it was factory unlocked so can't speak about the phone specifically but with the Desire S, also on O2UK, had a similar issue.
I've got the pin code
Thanks for your input, sure it's relevant.
I have the unlock code for the T-mobile sim card, but of course it's not recognized by the phone (or sim card?)
In the other phones tested the process was straight forward, just inserted sim, boot up and voilá.
Went to the Telcel's service center but the person there confirmed that it's unlocked.
I'ven reading about a "Regional Lock" of some Samsung devices, but i realy can tell if this the case.
Anybody else having this kind of issue?
Region locking I don't believe has anything to do with this. When the phone was unlocked, the region locking should also have been removed.

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I recently bought an unlocked sm-g930a. Do you know if updating with the new at&t 7.0 firmware will lock the sim to at&t again?
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I have bought a S8 locked to US Cellular on eBay, clean , not blacklisted and when I try a SIM card from my operator does not ask for unlock pin code and remains without registering on my network.
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qryche said:
Hi .
I have bought a S8 locked to US Cellular on eBay, clean , not blacklisted and when I try a SIM card from my operator does not ask for unlock pin code and remains without registering on my network.
Does anyone know any website or any method to unlock It?
Many thanks in advance.
Click to expand...
Click to collapse
Does it have a unlock app in apps drawer or in settings. It may be unlocked. If ure sim works. WhT carrier you on.
Thanks for your answer.
I live in Portugal and I tried 2 different SIM cards. The phone shows in upper left screen the message "SIM blocked". I searched for an unlock app too but I can't find any like in T-Mobile phones I bought in the past.
US Cellular is a CDMA network provider whereas in Portugal you probably have only GSM networks.
I think you should look into this and investigate this issues as well.
Another info: I flashed with Odin with the latest USC official Rom from sammobile. Can be this the cause?
This is 950U version and therefore has the GSM frequencies as well.
Even if it was only cdma it would prompt to insert the network unlock code....
Any help?
WHen I put a sim card it appears a forbidden sign on the top, where I should see the network signal...
https://www.youtube.com/watch?v=yysQbPLf8l0&feature=youtu.be

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