Lost my phone. If I don't find it what can I do to prevent it from being used?

I gather you mean you wish to disable it to prevent its use by another party.

Call the customer service number of your cell phone's company's hotline for lost or stolen phones.

Generally speaking, you should record the IMEI number of any phone you acquire and keep it with the receipt for the phone. If you have a post pay handset, your SIM card and phone will already be registered through your service provider. That service provider may be of assistance.

If you enabled phone tracking from Samsung before your phone was lost, they can track it for you. If you know the EIME or serial number of the phone, your carrier can track it or turn it off, otherwise, it's lost.

The phone "passcode" is used to protect someones' private info or to prevent someone from using your phone if it is lost or stolen.

I lost my Nokia C5, please can you help me to find where it is currently being used. If not possible, help me to block the phone.
Thanks

Unless you have tracker software installed on you cell phone, there is no way to track your cell phone.
You can try to ring your cell phone and hope the person who answers it will return it to you.
To lock your cell phone to prevent further use, please click on this link and follow my instructions :-
http://www.fixya.com/support/r5057854-lost_or_stolen_cell_phone

If you have lost your cell phone, try phoning your cell phone and hope the person who answers will return it to you, If not to prevent unauthorized use of your phone, please click on this link and follow my instructions :-
Normal 0 http://www.fixya.com/support/r5057854-lost_or_stolen_cell_phone

I dont understand ... have you lost your phone and you are looking for it? Yes? The first thing to do is contact your service provider and make sure it is turned off on their end - this will prevent someone from using it and running up your bill ... Secondly, you should make inquiry of your local police department.

Contact your service provider with the IMEI number and ask them to block the phone. This will prevent anyone from using it.

You need to contact your mobile phone service provider and get them you lock your phone number to prevent unauthorized use of your phone and unwanted phone bill.

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Solution - Keep the free space between 350 to 500 KB, so as to keep things running smoothly on your phone and prevent Nokia 3110c from restarting.
Cause 2 - Changing Themes - Some people have reported that the phone restarts automatically when they try changing display themes on the phone.
Solution - Don’t get your phone loaded with too many themes downloaded from the internet or atleast, don’t switch themes frequently. These themes, mind you, also load up things into your already falling Nokia 3110c phone memory.
Cause 3 - Memory Cards - Some people have reported that Nokia 3110c restarts due to some issues with the memory card.
Solution - Remove the card, get it formatted and then insert it back and then restore factory settings. This just might solve the issue.
Cause 4 - Transferring data via Blueooth / USB data cable (or) Updating Music Library - A few people have reported that their Nokia 3110c mobile phone restarts when updating the music library.
Solution - Don’t try updating of music library frequently or don’t often transfer data in/out of your Nokia 3110c phone.
Cause 5 - MP3 files
Solution - This may seem dumb, but consider converting all your MP3 music files to WMA and then store them on the memory card. Some users suggested this.