My Sony Ericsson T610 won't copy the contacts on to the SIM. And I don't have more than 100.

PUK stands for Personal Unblocking Key. This is a uniqueeight-digit code specific to your SIM card. This is required when the PINnumber to unlock your mobile phone is entered incorrectly 3 times. You are thengiven 10 attempts to enter your PUK code. If an incorrect PUK code is enteredafter the 10th attempt, you will block your SIM card permanently and willrequire a new SIM card from your mobile phone provider.
PUK codes can be obtained through the following ways - The PUK code is in your SIM card documentation Starter Pack.If you do not have this then -Please contact your phone service provider.
Your cell phone service provider can give you the PUK code once you give themyour account details and they have confirmed your identity.

To transfer your contacts through the SIM card:

1. Copy your contacts from your old phone to your SIM card. If you need help with this, please consult the old phone user guide.
2. When the copying is done, move the SIM card to your new phone.
3. Select Menu > Contacts.
4. If the phone asks you to copy info from the SIM card, skip steps 5-10.
5. Otherwise, tap Options > Settings > Contacts to display.
6. Select SIM memory > OK, then tap Back.
7. Tap Options > Mark/Unmark > Mark all.
8. Tap Options > Copy > Phone memory.
9. Tap Options > Settings > Contacts to display.
10. Select Phone memory > OK, then tap Back.

• First copy your contacts to your sim card from your nokia.
• Then put your sim into your sony and copy contacts(Sim to Phone).

you can check it with other sim card ,if it remains the same problem ,it may be locked to particular network wont accept any sim card other than the particular network ,you can unlock it and used to other network,try here http://www.superunlockcodes.com/sony-ericsson-t610/rs12wp9/

go to phone book then select options> advanced> copy to sim.
Good Luck

sir ,
first of take out ur sim card from mobile and switch off ur mobile phone . then again switch on ur phone ur phone will open in offline mode thenallcontact will be appear will be in phone memory . so now use "delete contacts" option .

You do one thing. First copy all the messagesyou have in the memory in a place. Then randomly delete all from the old phone. I'm sorry Sir, but messages can't be copied into the sim memory. Sim memory can only hold contacts ( that also to a limited extent ).

copy the sim card to your new one or just put the sim card into the new phone

whats my puk?my number is 6978669421

  this problem is due the sim space may be u have 32k or16 k sim  . so memory is nt  enough to save  all the contacts - so do these things to solve ur problem ..

1) if u have an alternative sim   which is 64 k sim then copy all the contacts  in that sim then transfer them to ur required phone afterwards ...

 2) if u any other alternate phone than transfer half the contacts in first atempt than transfer rest the contacts in other atempt...