I have att/cingular and the my sx66 is locked to cingular. When I insert my sim(3g by the way) and power the phone it goes through set up fine, but when it gets to the home/dialer screen, it says "invalid or missing sim card..." what can the problem be? I got it to work once but not long after the "invalid sim popped up again." Everything else works perfectly fine. I took it to an at&t store but they said they didn't know what the problem was. They gave me a new sim card but it doesn't make a difference? Does anyone know how to fix this issue.
Try www.xda-developers.com and ebay for ROM upgrades. There are many people who unlock these kinds of devices. I don't believe you can upgrade it to WM 5.0 or beyond, but that may be possible. The best bet is a newer version of PPC 2003.
The process is relatively simple. Once you have your ROM on CD or via download, You run it with your device hooked up to your PC via cable/cradle and connected via ActiveSync (3.7 or later). The warning is an improper ROM load could make your device unusable. It is a risk you have to take if you want it to make calls. Toss up: no phone Pocket PC, pocket PC phone, or shiny brick. If the XDA site has recommendations on a ROM source, they are not likely to steer you wrong. They will state emphatically, that you do not want any interruptions in the ROM upgrade process. If you have a power outage or something shuts off for any reason, you will have the shiny brick and be looking for a new device.
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Call your carrier tell your carrier's customer service representative that you're traveling abroad and want to use a foreign carrier's Sim card If they don't give you the code, stick by your guns and ask for a manager.
It's asking for a PUK code, which you need to get from your provider. You can call customer care and they can give it to you. If you put the wrong code in 10 times your phone will permanently lock, so be careful!
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.
As I understand it, the SIM card is what tells your wireless unit which service provider to use. If you have an old phone, it should be an easy matter to take the t-mobile SIM card out of it and install it in the SX-66. One note on the SX-66: the SIM card on mine had a tendency to lose contact (and my contacts would disappear) from jarring until I put a piece of scotch tape across the bottom of it. No problems after that.