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I assume you mean the phone is asking for a network code or password before the Start Menu is available, ie, phone can be used.
If this is so and it is asking for a network code, then you need a SIM card that matches the carrier the phone was designed for. If it is ATT/Cingular, you can buy a SIM card from the new ATT/Cingular network for $6. It is a pay-as-you-GO phone SIM, but once you have it, you can call ATT to as for a number xfer as well as a standard monthly contract using this SIM.
If it is from the old Blue ATT network, then it cannot be used on ANY carrier unless it is unlocked for use on ALL carriers. This would be noted witht the docs that came with the camera. If nothing says ATT/Cingular, and especially if someithing says ATT without Cingular, then it is probably an old Blue ATT phone. You can buy a BLUE SIM off ebay which will get you to the point of being able to use the phones functions, but it will not work to make calls until you unlock it and replace the BLUE SIM with another current carriers SIM. Sprint will not work either because it is not a GSM ATT type network. Cingular and T-Mobile yes.
Google phones model number and UNLOCK and you will find a way to do it yourself at no charge if you have an XP or earlier PC with a USB port. Vista OS cannot be used to do it with the downloaded unlock software. It is also very hard to find anyone that can do it selling Unlock Codes based on phones IEMI code.
If it is not a network lock message, then it may be the last users personal lock password. In this case, you can hard reset the phone by holding down both right and left softkeys while powering on the phone.
Screen sound bad, or intermittent connection inside. You can find disassembly instructions on the net. Search with phone model and disassemble. Remove and reattach all cables in case one is lose or contact dirty.
Start with another battery. Borrow a friends or they are available on Ebay rather cheap. Or, go to your Cell Carrier and ask them to help you try another battery.
Have you tried charging it through the USB port of you computer? The phone is designed to charge from a USB port also, but computer must have ActiveSyn phone driver install and be recoginzed by the computer in order to charge using USB port.
Use Media Player on your computer to SYNC you music files to your phone. After files a synced, go to Media Player on phone and click right soft key MENU and select UPDATE Music/Audio Files, then select SEARCH.
If your battery goes COMPLETELY dead, which it will do if phone is not turned OFF and not used for a long period of time, you will need to JUMP START it using you OEM SMT-5600 AC charger. Other AC chargers will not work for this purpose and neither will a USB port.
You can JUMP START the battery using a USB port by cutting off a USB cable to expost the red and black power USB PORT power pins 1 and 4. Remove your SMT-5600 battery and while the modified USB cable is plugged into your USB PORT, hold the BLACK wire to the negative (-) terminal and the RED wire to the positive (+) terminal for about a minute. Replace the battery in the phone and connect the phone to a USB PORT using a standard USB cable. The SMT-5600 charging light may not register for a while, but will eventually light amber to show it is charging, assuming your phone is recoginzed by your computer.
Note some mini USB cables DONOT carry the USB power leads through to the phone, only data. If you have a very thin USB cable, be suspicious the power leads are not being carried in the cable.
Since the USB PORT power is limited to 100ma it cannot hurt the battery, but will insert enough current into a totally flat batter to cause the battery to register a voltage large enough to alllow USB PORT charging, typically 3.7VDC.