My nokia 6120 cannot get a signal, always states this: "sim card registration failed" but everything else opens and can be used except for calling and text.

If your Nokia 6300 phone displays an error message saying "Invalid Sim (or) Sim Registration failed" then your phone is probably network locked.
You can unlock it easily by using an unlock code.You can get this code at reasonable cost from TheUnlockArena.com with easy step by step unlocking instructions and unlock it.Then you can use freely any GSM network Sim card.

Hi,
The master code to unlock your Nokia 6120 is 2312573625.
Hope this helps, thanks!

If you used a same SIM card for those phones, I think its signal problem, when signal is low the connection will be disturbed sometime as no sound or cut suddenly during call conversation. Try to use different SIM card provider, with stronger signal will better, then put in these device. If the problem solved then its operator signal problem. The solution is change the SIM card.
But if you have try to change with other SIM card with stronger signal but people still can't hear you, then its microphone problem. You need to repair or replace your phone's microphone.

Hope this help and if this helpful RATE please.

nokia 7230 it will say "sim card registration failed" no signal. cant make any calls. take the battery and sim card out and put it back in and the error message is GONE and works again. signal is back and can make calls. thought it might be something wrong with the sim card. did a sim swap. still does it. EVERYTIME i get that message and take the sim card and battery out and put it back in it works FINE. something wrong with the phone right? bought it in may this year.

my cell no. is 1662 and its sim card registration failed. how can i solve it.

Clean the backside of the SIM and the connectors where you insert it. Clean it with a cotton swab dipped in whisky. Before you do that, squeez the dripping liquid (as you would not want your phone getting intoxicated). The alcohol cleans better that any thing else.

is a problem with your sim card, it has become corrupted. get a person at your phone shop to transfer your phone number to a fresh sim card.

There are 3 causes of Sim Card Registration Failed, when you first turn on the phone, the sim card attempts to connect to the network if it can not do this it gives a message like Sim Card Registration failed.

1, The sim card is turned off, if you have had the sim card for a while and it hasnt been used they will turn it off, you need to contact them from another phone to get it turned on or get a new sim card.

2, The phone has a hardware reception problem, when it attempts to register itself with the network it can not... There is a reception problem and it requires repairs, this isnt really an easy diy job on this handset.

3, The phone is blocked, i.e reported lost or stolen. Some networks when a phone is reported will allow it to get reception but will not let it make calls, however other networks will not give it reception at all and hence you get a Sim Card Registration failed message.

I hope this helps, these are the causes of the message

hello sarah_fox,
Please Press [ *#0000# ]
and tell me whats appear
Thank you for using FixYa.

most of this nokia phone(the old ones) do often experience such problem due to it's constant falling on the ground.
in such cases after restarting the phone the problem should be corrected for a while...............using a NEW sim card and practically the one of a network with the strongest signal does in most cases rectifies the problem a bit.
all the same i would ask you to send it to a phone technician for more help.
good luck