Blackberry Curve 8310 error message "SIM not allowed." How do I fix it?

Do you need to unlock your Blackberry Curve 8310 from network lock?Blackberry has 10 unlocking tries..So you have 4 remaining unlocking tries.You can get the unlock code from the site
Classicunlocking.com for Blackberry Curve 8310 and unlock it easily using the unlocking instructions below...

Blackberry Curve 8310 Unlocking Instructions

Warning : Do not enter any wrong unlock codes on your Blackberry Curve 8310 mobile phones. If you enter over a certain amount of wrong unlock codes on your Blackberry Curve 8310 mobile phone, your phone may get hard locked and sometimes become unusable.
1 - Switch on your Blackberry Curve 8310 with any Sim card and Turn off all Wireless connections.
2 - Go to Settings.
3 - Go to Options.
4 - Select Advanced Options.
5 - Select SIM Card.
6 - Type MEPD using your Blackberry Curve 8310 keyboard (NOTE: You will not see any text appear on the screen while typing MEPD),
7 - Type MEP then hold 'ALT" key and type number 2.(NOTE: You will not see any text appear on the screen while typing MEP2),
8 - You will then be presented with a prompt "Enter Network MEP Code". Type in the Unlock Code and press in the track wheel / jog dial to confirm,
9 - Your Blackberry Curve 8310 will now be unlocked.

Try to unlock your phone using correct blackberry curve 8310 unlock code, you can get that code by asking to your network provider and need some cash to get that. You also can get instant blackberry unlock code from online shop for quick delivery service with lower cost.

Your phone still locked only for T-mobile network, that's why you got error message when you change your sim card. You must unlock your blackberry using blackberry curve 8310 unlock code for T-mobile network. Blackberry unlock code can be obtained from your network provider in this case T-mobile or you can buy from third party sites. Both of them will take you some charge but third party sites have lower cost and quick delivery service rather than network provider.

If you're getting an error saying "Invalid SIM Card" or "Incorrect SIM Card" then the you would need the unique unlock code for the phone.

Unlock AT&T Blackberry 8310



Unlock AT&T Blackberry 8310

how you know its unlocked?If any message you received when you insert the sim?
it may be due to network lock,you can get try unlock codes here http://www.onlinegsmunlock.com/blackberry-8310/rs7wp9/
you need to specify the country and network provider

jum error screen blackberry 8310

maybe your children did some thing

Perform the following steps to try and resolve the issue:

1. Remove the battery cover.
2. Remove the battery (while the device is still powered on).
3. Remove the Subscriber Identity Module (SIM) card.
4. Reinsert the SIM card and the battery to reset the BlackBerry smartphone.

It's a clear and fully detailed guide on how to unlock a BlackBerry 8310 ' Curve :

1. Insert any sim card
2. Turn off all of the wireless connections
3. Go to Options
4. Select Advanced Options
5. Select SIM Card
6. Hit menu select show keyboard (if your BlackBerry have touchscreen)
7. Type MEPD ( you will not be able to see what you are typing )
8. Type MEP2 or MEP4 ( you will not be able to see what you are typing )
9. Now the phone will prompt you to enter the mep code
10. if you not already have the code, then i suggest BlackBerryMEP.COM to get it from .
11. Enter the mep code ( you should see "code accepted" )
12. Restart your BlackBerry .

All done.

SOURCE : BLACKBERRYMEP.COM

you can Unlock your Blackberry 8310 Curve with imei unlock code. it is very simple and eaisiat way to unlock your Blackberry. get your Blackberry 8310 Curve Imei Unlock Code . and use any gsm sim card.
i hope this will help you .