I have a sgh a411 old phone that gives the message phone freeze sim unavailable.....I have the unlock network code but it seems I've already stuffed things up because it is frozen. The phone is not frozen when I use a sim from the original service provider.

You need to Unfreeze Your Phone,You can get the Unfreeze Code from here Wickedunlock and Unfreeze Your Samsung Phone....

phone freeze

Fully charge your phone the with no sim try *2767*3855#

If you have entered the wrong unlock code too many times, your phone will lock up.  Call AT&T for further directions.

Type *#9998*627837793# Go to the 'my parameters' and there you will find new menu where you can unlock phone.(not tested-for samsung C100)
To unlock a Samsung turn the phone off take the sim card and type the following code *#pw+15853649247w# .
Java status code: #*53696# (Samsung X600)
If you want to unlock your phone put a sim from another company then type *#9998*3323# it will reset your phone. Push exit and then push 7, it will reset again. Put your other sim in and it will say sim lock, type in 00000000 then it should be unlocked. Type in *0141# then the green call batton and it's unlocked to all networks. This code may not work on the older phones and some of the newer phones. If it doesn't work you will have to reset your phone without a sim in it by typing *#2767*2878# or *#9998*3855# (not tested)

Hi, This message comes up when i insert my own sim.
Phone Freeze SIM Unavailable Please Contact Service provider.
What to do?

try to flash ur phone then give it the unlock code!!

take the sim out of the phone, turn it on and type *2767*3855#. this will reset the phone and take off any codes.

my samsung z500 hang after 1 min it turn on. keypad and other thing does not work.