To fix you invalid Sim problem you have to unlock your mobile. Use unlock code to unlock your Blackberry 8900 . Get the code from the site Unbblock.com by submitting country, network provider, IMEI number to them. Here they are providing unlocking service only for Blackberry phones at low cost. Unlock it yourself using step by step unlocking instructions which is given in the site itself.
SOURCE: RIM BlackBerry 7290 network problem
James
This seems to be the multimillion dollar question for Blackberrys and here is how this works.
There is no "magical"code for all BB's
Each Blackberry is item specific based on your IMEI which is located on the inside of your battery compartment.
Your best bet is to go to eBay or similiar and find your blackberry and look for the cheapest unlocking program. AT that point you will be able open your Blackberry.
SOURCE: I NEED MEP Code, because my Blackberry Curve 8310
you will need to try online or take the phone to a shop that unlocks blackberries
SOURCE: blackberry 8320 sim support problem
You have to unlock your blackberry, in order to do so, visit http://blackberrymep.com and get your unlock code with instructions to unlock, it's fast and rapid, you will get your blackberry unlocked in five minutes .
SOURCE: blackberry curve 8310 says invalid sim
Hi,
it means your BlackBerry is network locked. You need to unlock your blackberry 8310.
gsmwong
SOURCE: my blackberry 8900 wont read my sim card
Is the sim card from the same provider? If so, please report to your mobile provider and they will resolve the issue.
If the sim card is not from the same provider as the mobile then you need to unlock your phone to be free to use on any GSM network. You can do this by calling mobile provider and requesting unlock code or buying one online.
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