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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > Samsung > Samsung Android based phones

Samsung Android based phones Discussion and all of your questions relating to the Samsung Android based phones.

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Old 05-18-2013, 15:41   #1 (permalink)
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Samsung S4 SPH-L720 GSM UNLOCK

Hi guys. anyone know how to unlock this phones Samsung s4 SPH-L720
i tot this phones is unlock when i back to my country i put local simcard
and its say invalid sim. is there any way to unlock it?i need it for GSM only
Old 05-21-2013, 17:05   #2 (permalink)
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Me too, i have S4 SPH-L720 from Sprint.
Old 05-22-2013, 06:33   #3 (permalink)
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a bit of help

I found this method posted on Redmondpie, I'm very interested in getting the Sprint Galaxy S4 and unlocking to use it with a GSM carrier as well, please report if this method works:

Step 1: Launch the Phone app on your Galaxy S4, and dial in: *#0011#

Step 2: Press the Menu button followed by the Back key. Then, hit the Menu button again and select KEY INPUT. Enter 1 and press the OK button to enter ServiceMode.

Step 3: Press Menu one more time and tap back again. This will pull up the Main Menu for ServiceMode. Tap [1] UMTS.

Step 4: Now select [1]DEBUG SCREEN, followed by [6] PHONE CONTROL.

Step 5: From the next screen, pick [6] NETWORK LOCK.

Step 6: You’ll get three options. Hit the one that says [3] PERSO SHA256 OFF.

Step 7: Now, you need to get back to Main Menu. To do this, hit the Menu button followed by the Back key. In Main Menu, now pick [6]COMMON, and then [6] NV REBUILD.

Step 8: The phone will tell you that a Golden Backup exists. Tap [4] Restore Back-up.

Your device will now go through a series of “conditions”, where it will first freeze, then get on a black screen with Blue LED on and both capacitive buttons on, after which it will reboot automatically. The whole cycle might take a couple of minutes, so be patient. Once it powers back on, it’s network unlocked, permanently. Enjoy!

Thanks, Caesar for the hat tip!

Source: How To SIM Unlock Samsung Galaxy S4 GT-I9505 For Free | Redmond Pie
Old 05-22-2013, 10:11   #4 (permalink)
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Did anyone try this...does this work....please let me know....Thanks
Old 05-26-2013, 19:16   #5 (permalink)
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it doesn't work on my gs4 SPH.

I tried that numerous times but when I put the unauthorized sim in my galaxy s4 SPH-L720 sprint it still says unvaild sim. Is there another way to gsm unlock my phone. Also my phone was rooted when I bought it is that effecting something or is there a step they didnt mention. I need this phone unlocked. Help please......
Old 05-30-2013, 10:22   #6 (permalink)
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i try this but it does not worked my phone show invalid sim
Old 06-06-2013, 11:20   #7 (permalink)
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Hi, I need this phone unlocked too, I've tried numerous times the *#0011# thing, but nothing works, I've tried even unlocked by another company who unlocks phones and nothing, it reaaaaaaally urges me to have it unlocked, and unfortunately I have 2 S4 Sprint L720... Could someone help us?????
Old 06-07-2013, 15:33   #8 (permalink)
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Me too, i have S4 SPH-L720 from Sprint.
I bought a Galaxy S 4 from the U.S. Amazon ..Bad company Sprint ...I live in the Kingdom of Saudi Arabia in Asia ..Never before me that I have visited America ..When I spoke with the company they said to me: We can not help you
Old 06-14-2013, 08:22   #9 (permalink)
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Any development on this S4 SPH-L720?
Old 06-18-2013, 00:14   #10 (permalink)
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Any results?? I need to unlock 1 piece
Old 06-18-2013, 08:10   #11 (permalink)
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i also try this method but but not unlocked still invalid sim
Old 06-19-2013, 21:05   #12 (permalink)
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by these steps does not work
Old 06-24-2013, 03:41   #13 (permalink)
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does not work

Only works for GS4 GT-I9505 will not work with Sprint SPHL-720, From what I hear the GSM radio is not turned on in the 720 although the phone detects the card the radio is off by Sprint. Sprint also says that the sim card is for LTE only..(lie) and in the same sentence they say it can use GSM network if I was to travel to Mexico. Somehow you must activate the gsm/umts radio. This is a software problem. Read the box of the SPHL-720 it states it is an/and uses GSM/UTMS device/service.
Old 07-03-2013, 22:54   #14 (permalink)
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Any updates on how to turn on gsm radios on samsung l720?
Old 07-11-2013, 09:34   #15 (permalink)
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doesn't work for L720 Sprint phone. It doesn't even ask for code and I don't see any where on the net yet as to how to enter code or direct unlock.
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