Question about Samsung Blackjack SGH-I607 Smartphone

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Switching t-mobile to cingular

I have a plan with t-mobile and my phone broke. I have a cingular phone that doesn't work so i took the SIM card out and put my T-Mobile one in. Then its telling me that i need a unlock code.

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Thats because the t-mobile sim cards aren't designed to be used in at&t phones. you either have to buy a new t mobile phone or get a plan with at&t.

Posted on Oct 30, 2008

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Where can I buy a sim card to use while traveling out of Canada to the United States?


First, you need to make sure your phone is SIM unlocked. After unlocking your phone, you can purchase an Cingular (AT&T) SIM card on eBay. Then call 1-800-331-0500. And set up a Go Phone account.

Go Phone is owned by Cingular (AT&T) in the United States. This is a pre-pay cell phone account that uses the Cingular (AT&T) SIM cards. You will have several options as to how you will be billed depending on the service you require. Pre-pay data is also available too, for an extra fee with the Go Phone plan.

See Go Phone Plans: http://bit.ly/cIo8dG


AT&T uses the 850/1900MHz band (1900 MHz UMTS band for 3G data) for cell phones in the US. Make sure your phone can use this bands.

If you need to SIM unlock your phone, you can do this two different ways.

The first is to contact your service provider and inform them that you need to have your phone SIM unlocked for international travel. Most providers require your account to be in good standing and that you've been their customer for a certain amount of time. Then, it's free.

The second is to purchase an unlock code. These can usually be found on eBay for as little as $2 US.

To search for the unlock code for your phone, on eBay, type in your phone model and the words 'unlock code' and your current service provider. (Example: Samsung BlackJack i607 Unlock Code Rogers) Once purchased, simply follow the instructions sent to you with the code and unlock your phone - then use the Cingular (AT&T) SIM card with the Go Phone pre-pay plan.

Tip: On some phones you must insert a SIM card NOT used by your current service provider when you enter the unlock code.

Mar 26, 2010 | Motorola Mobility RAZR V3c Cellular Phone

2 Answers

Need to know unlock code for alltel HTC PPC6800


sell the phone on e-bay and purchase a cingular phone. only t-mobile and cingular can be unlocked. alltell phone work on a differnet frequency and cannot be compatible with these carriers like yours. sorry.

Jul 31, 2009 | Cell Phones

1 Answer

Mobile shows "Sim Card not Valid" where sim card is OK


Are you using the same cell provider? Example: Cingular phone and Cingular Sim Card. Because you can't use say a T-Mobile phone and Cingular Sim Card. Don't really know a solution just thought maybe this might help.

May 08, 2009 | Nokia N70 Cellular Phone

1 Answer

I have a t-mobile phone but a cingular smart card...


If the Cingular SIM card won't operate the T-mobile phone now? You'll have to have the phone "Unlocked" for it to work with your ATT/Cingular SIM Card. Some local Cell Phone Shops may provide unlocking services for a nominal fee (you'll have to call around and ask), or you can send it out to be unlocked as this service can be found by searching online, as you can see here: http://www.google.com/search?hl=en&q=cell+phone+unlocking&btnG=Google+Search

May 15, 2008 | Lands Phones

3 Answers

Sim lock code


try unlock codes from http://www.unlock-free.com/ and http://www.mobile-unlocker.com/ to unlock your phone

Apr 02, 2008 | Motorola Mobility V557 Cellular Phone

2 Answers

Cingular Sims Cards works in Tmobile Sidekick?


No Only Cingular Sims Work In Cingular Phones.

Dec 23, 2007 | T-Mobile Sidekick II

1 Answer

Subsidy password?


This phone must be made for use on T-Mobile or Cingular/AT&T? Cell phone companies don't want you using their phones with other carriers if you decide to switch. They figure this will keep you from switching. A t-mobile phone will only work with a t-mobile sim card. Same with Cingular. When you put in a sim chip from another carrier, the phone wants a password so you can use it. But you have to get the password from the carrier that sold the phone to use another carrier. There are ways to get this code if you want it.

Dec 05, 2007 | Motorola Mobility W375 Cellular Phone

2 Answers

Sim card and unlock feature


SIM cards can only be unblocked by the Service Provider (cingular, t-mobile, etc). They have a specific code based on the SIM card number. If you have entered the incorrect code more that 5 times, you will invariably incapacitate the SIM card. Contact your providers support department, or go to the store and they should be able to take care of it for you. Best of Luck.

Sep 16, 2007 | Motorola Mobility RAZR V3

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