Question about Nokia 6790 Surge Cell Phone

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My friend passed on this phone to me and i put my optus sim card in and it said sim card not valid? What do i do for it to work ?

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Posted on Nov 11, 2010

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Nokia 5800 xpressmusic. i just recived this new phone from a friend because he bought a new phone. i put my sim-card in it it asks me for my simcard code. it accepts the simcard code but than it says...


I'm assuming your both on the same network? If your both tmobile customers or AT&T it should work without problems.

If not. The phone needs to be unlocked. to be used with another sim card from a different company.
And to do that. Your friend can call his carrier he bought the phone from, request an unlock code, then unlock it that way, and you'll be able to use it just fine.

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I've setup Nokia phones with 2G SIM's and I've had it running under GSM frequencies using a Optus 2G GSM SIM card; works fine. I've also put 3G SIM's in 2G Unlocked Phones and haven't had any issues before.

Have you tried putting in a 3G SIM and had problems?

Is your phone locked or unlocked?

Be careful of the terminology, some people get "3G" mixed up with the company "3" which is owned by Hutchison.

For example, if the phone is locked to 3, and you try and put an Optus/Voda/Telstra/AT&T SIM inside it will not work.

If it's just a Generic Branded 3G phone you should be fine.

Make sure your phone is unlocked, then purchase a SIM online or back at the AT&T store.

You should be able to take your phone back to the "stupid people" at the AT&T store and have them register a 3G SIM and you shouldn't have any problems; just tell them it's a unlocked phone.

Here are some helpful links:

http://www.planetomni.com/FAQ_sim.shtml


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Was your phone purchased from another phone company? or second hand? it could be SIM locked, and it will have to be unlocked by the company it was purchased from.

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