I would recommend using Pocket PC 2003 version instead. WM 5 or 6 may have significant issues with phone compatibility. If you can go back to 2003 and the phone still doesn't work there may be a hardware issue, then you need to replace or repair. Replace is usually the better option. Search ebay.com if that is what you need.
Below, instrutctions on getting ROM for PPC 2003:
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. Search for WM versions that include "unlocked" versions. 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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HI is your Nokia E62 mobile is asking for a network lock code once you insert your sim in it then it mean your phone is locked to some other network provider due to this it wont accept any other GSM sim until you unlock it ...You can easily unlock your phone using sites like TheUnlockArena.com here they are rendering network unlock code for all mobile models at reliable cost .You first check that whether the code is available for your country and network provider .IF yes then pay for it and unlock your phone then freely use it with any GSM sim ..
Do you want to use any GSM network sim card in Sony Ericsson WT13I Phone?You need to unlock from T-mobile network lock.Get the unlock code from the site Simpleunlocking.com and unlock it from service provider lock.Then use any GSM network sim card in it.
It sounds like the phone is locked to AT&T and you're trying to use another SIM. You'll need to unlock the device to use it with another carrier. You can buy an unlock code here: http://gsmunlocklabs.com/samsung-unlock-code/
If the Phone says Invalid Sim card means you need to Unlock the Phone from the Network lock,then you can use any GSM Network Sim card,Find out the Current Network and Country it locked now.then get the Unlock code from here
unlocking4u.com and get the Free Unlocking instructions from here Mobileunlockguide and Unlock it step by step.
If the Phone says invalid Sim card means it locked to some network,You need to Unlock it.....You can Unlock the Phone,using the Unlock code from here Superunlockcodes and Unlock it.Check code for Your network lock and Country and Unlock it.....Then after unlock it you can use any GSM Network Sim card in the Phone,.
It may locked to some Network,so that it's Not detect the Sim Card...You can Unlock the Mobile using the Unlock code,You can get the Unlock Code at http://www.onlinegsmunlock.com/htc-tytn-2/rs7wp9/ and Unlock it from NETWORK LOCK....Check code for your network lock in the list...then you can use any GSM Sim Card it will detect.......
It's a clear and fully detailed guide on how to unlock a BlackBerry 8310 ' Curve :
1. Insert any sim card 2. Turn off all of the wireless connections 3. Go to Options 4. Select Advanced Options 5. Select SIM Card 6. Hit menu select show keyboard (if your BlackBerry have touchscreen) 7. Type MEPD ( you will not be able to see what you are typing ) 8. Type MEP2 or MEP4 ( you will not be able to see what you are typing ) 9. Now the phone will prompt you to enter the mep code 10. if you not already have the code, then i suggestBlackBerryMEP.COMto get it from . 11. Enter the mep code ( you should see "code accepted" ) 12. Restart your BlackBerry .