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As a first step, Update the operating system to the current level. That may well make your issue disappear. Here is a link to Blackberry to get the latest software update for your 8520.
Do you want to insert other network sim or if your Blackberry Curve 8350I displaying insert sim card,if already sim card inserted.Don't worry i will help you.You can insert other network sim card in the phone by unlocking the phone from current network lock.To unlock Blackberry Curve 8350I use unlock code.Visit the site Wickedunlock.com get unlock code and unlock it easily.Then insert any GSM network sim card.If the phone displays insert sim card even though sim card is already in the phone.Please remove the sim card and replace it correctly.It is because the phone didn't detect the sim correctly.After inserting if it is display invalid sim or sim not valid message on the screen.It is locked to some network,you need to unlock it.To unlock use unlock code.Get code from online site and unlock it.
for blackberry smart phones if its not atall working and displaying reload software then its better you visit or contact blackberry immediately or it the handset is working displaying the message then you can visit brothersoft.com to get the software for blackberry curve 8520.
Perform a soft reset on the BlackBerry by hitting the device's ALT, Right Shift/CAP and DEL keys simultaneously. The BlackBerry display then goes black, the LED indicator turns red and the reboot process continues. Depending on the model and software used, the device will reboot in a minute or two.
to do a hard reset take out the battery and the put it back.
hi jamie farrel you can go into the phone book. hit the blackberry it should come up with displays. You need to display all. if you still can figure it out. their is a blackberry answer key icon on your phone. hit that icon and you will be able to answer this and more questions.