Turns off automatically in middle of calls blackberry curve 8310

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.

Reset your blackberry phone, if that problem still occured try to unlock your blackberry network using blackberry curve 8310 unlock code. You can get blackberry unlock code from your network provider or you can buy from third party sites if you don't want to wait for a couple of weeks.

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This issue only occurs when trying to send a SMS text message from within the call details screen of a call in the call log.
To avoid this issue, complete the following steps to send a SMS text message from the call log screen:

1. Open the Phone application.
2. Open the Call Log by clicking the middle button in the toolbar.
3. Touch the call log/contact in the list without clicking the screen.
4. Display the menu, then select SMS Text (Name/Number).
5. If required, rotate the BlackBerry smartphone to switch to landscape mode.

We suggest you to visit the service provider outlet to check the battery status and condition.

Try to re-run the OS install.

how setting invalid sim ? cell phone setting or software plz ask me reason

unlock your Blackberry eaisly with Blackberry Imei Unlock code. first call your service provider ask your Blackberry Mep Code. But it takes time to give your Mep Code. or other option is go online. there are thousand of sites available to provide Blackberry curve 8310 Unlock Code. Buy your unlock code from third party.

please help i can not receive any sms.

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 .