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Switching SIM card

I have Cingular wire service and got a free phone when I added another line to the family service (Motorola something or other and I can't hear on it and just hate it) I bought a Motorola V170 Tracfone ($20) and want to use my Cingular SIM card in it. How do I switch? I've been told it can be done, but I haven't found a solution yet. I can't afford to buy another phone thru Cingular.

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Re: Switching SIM card

I found this information on this guide on eBay

Posted on Jan 21, 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:

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

1 Answer

I Need the unlock code for a t-mobile motorola v300 Phone. Bought it at yard sale. Want to make it use cingular sim card.

Call T-mobile customer service and ask them that you want to place a phone unlock order (use these terms, so that you know that you know what you are talking about), and it depends on the person you are talking to you. they might not ask you alot of question, just your IMEI/ serial no and an e-mail they will forward the unlock information to, it takes some while for them to send you the information.

You can switch your service to 'Cingular' if you want to by popping in a new cingular SIM card,but can't use Verizon and Sprint service's(operate with CDMA).
Hope this Helped!

Jun 22, 2009 | Motorola Mobility V300

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Sim lock code

try unlock codes from and to unlock your phone

Apr 02, 2008 | Motorola Mobility V557 Cellular Phone

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Free unlocking or subsidy code for mobile phones

Hi, Can you provide free unlocking or subsidy code for mobile phones? Thanks.
Can you please help me unlock Motorola Razor V3xx. freddie1946

Feb 19, 2008 | Motorola Mobility RAZR V3xx Cellular Phone

1 Answer

Motorola razr

1. take off the battery cover, and the battery, look at the sticker, should state model there.

2. sounds like an internal phone problem. try calling customer service @ 611 on a cingular/AT&T phone, or 1-800-331-0500

Jan 06, 2008 | Motorola Mobility RAZR V3m Cellular Phone

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Motorola razr v3xx

it would be best to go have the phone firmware reflash and the card reformatted.

Dec 14, 2007 | Motorola Mobility RAZR V3xx Cellular Phone

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

1 Answer


ask t-mo tech support they will unlock phones under certain circumstances. I can't tell you what they are
but i just talked to a tech and he confirmed it.

Nov 05, 2007 | Motorola Mobility A630

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