My SAMSUNG GalaxyS6 isn’t reading the SIMcard. I turn it on it brings up NO SERVICE also INVALID SIM CARD Network lock sim inserted. I don’t understand it was working earlier today.

If the Samsung C3050 says invalid Sim means it locked to network ...you need to unlock it...You need to specify the network locked in spain...I have unlocked my SAMSUNG C3050 from Vodafone spain using the unlock code from the site Simpleunlocking.com/samsung-c3050/rs16wp9/ and got the free UNLOCKING instructions at here Mobileunlockguide.com and unlock it step by step.So you can unlock it and use woth any GSM Network Sim card.

Your mobile is locked with some network provider.So whenever you insert a other country network your mobile displays the message like "simcard invalid" .This sim lock can be removed using the codes.If you need get the unlocking service from Superunlockcodes.com .Through this you can unlock your mobile easily.

This is the message I got. I have the same problem and I've been trying to find a solution online for hours because I really don't feel like calling and talking to anyone.

list of samsung codes for u
Quote:
PLEASE BACK UP YOUR FILES BEFORE UNLOCKING
This will also bring the phone to default settings
1. First do a CUSTOM reset: *2767*2878# (star 2767 star 2878 hash)
turn off the phone
2. take out the battery and sim and put wrong network SIM and insert a half of it,(pic2501)
so it won't ask for network password and shows "Insert SIM" message.(pic sam25020)
Now put the battery ,and switch the phone on .(phone shows "InsertSIM" message.)
3.With out turn off the phone push the sim fully in. At this stage the phone isstill asking to "Insert SIM"
4. Make a FULL reset by typing: *2767*3855#(star 2767 star 3855 hash)
5. The phone should reboot working with "wrong" sim inside.
6. Make a Change the NCK password to 8 zeros by typing: *7465625*638*00000000*00000000#(star7465625 star 638 star 8zeros star 8zeros hash)
7. Now Disable networklock By typing: #7465625*638*00000000#(hash 7465625 star 638 star8zeros hash)
Phone is unlocked (check with *#7465625#)

For Model:
Samsung A300
*2767*637#

Model: Samsung A400
*2767*637#

Model: Samsung A800
*2767*637#

Model: Samsung E500
*2767*688#

In newer phones:
#*7337#

Model: Samsung E700
*2767*688#

In newer phones:
#*7337#

Model: Samsung E715
Turn off the phone. Put a non-accepted Simcard and turn it on. Type*#9998*3323#. Press Exit. Choose menu #7. After phone reboots type *0141# andhit the Call button. Turn off and insert another Simcard. Turn on. The code is00000000.

In newer phones:
#*7337#

Model: Samsung M100
Type *#9998*627837793#. Then type *#9998*737#. Press >/[] (Play Stop) untilphone shows NCK/SPCK number. Press Exit. Type #0111*CODE# (Code is the last 8digits of the NCK/SPCK)

Model: Samsung P400
*2767*3855#

In newer phones:
*2767*927#

Model: Samsung S100
*2767*7822573738#

Model: Samsung S105
Remove Simcard. Enter *2767*7822573738# and after phone reboots, enter#0111*00000000#

Model: Samsung S300
*2767*7822573738#

Model: Samsung S307
Turn off the phone. Put a non-accepted Simcard and turn it on. Type*#9998*3323#. Press Exit. Choose menu #7. After phone reboots type *0141# andhit the Call button. Turn off and insert another Simcard. Turn on. The code is00000000.

In newer phones:
#*7337#

Model: Samsung S500
*2767*3855#

In newer phones:
*2767*927#

Model: Samsung SGH600
*2767*3855#
*2767*2878#

Model: Samsung SGH2100
*2767*3855#
*2767*2878#

Model: Samsung V200
*2767*7822573738#

Model: Samsung X100
Turn off the phone. Put a non-accepted Simcard and turn it on. Type*#9998*3323#. Press Exit. Choose menu #7. After phone reboots type *0141# andhit the Call button. Turn off and insert another Simcard. Turn on. The code is00000000.

In newer phones:
#*7337#

Model: Samsung X600
Turn off the phone. Put a non-accepted Simcard and turn it on. Type*#9998*3323#. Press Exit. Choose menu #7. After phone reboots type *0141# andhit the Call button. Turn off and insert another Simcard. Turn on. The code is00000000.

In newer phones:
#*7337#

Model: Samsung Universal
TEMPORARY UNLOCK:
Put a non-accepted Simcard and turn it on. Type *#9998*3323#. Press Exit. Youwill get a new menu. Select Malloc Fail.

In newer phones:
#*7337#

d500 - #*7337# - ( but not in the newer software versions )

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update 04/02/07

1. If you have changed your phone password, change your password back to thedefault 8 zeros (00000000).
1a. NOTE (Modification here by my experience): Goto SETTINGS, SECURITY, thenSIM LOCK and disable this before proceeding.
2. Put a SIM card that is from a network other than the one your phone islocked to
3. When Incorrect SIM error comes up, type *#9998*3323#.
4. White screen will appear with an exit option. Press the right softkey.
5. From the menu that appears, select the Malloc Fail option. This will rebootthe phone and the normal service screens will appear.
6. Type *0141# and then press the green call key. "Personalization"or "Personalized" will appear.
7. Turn off your phone and put the original SIM back in.
8. Turn on your phone. You will receive a prompt to enter a password.
9. Type 8 zeros (00000000) (This is because the SIM LOCK mentioned earlier getsswitched back on)
10. Completed. You have now unlocked your phone.

tested on e900 and d900 phones - may work on similar models but not sure
ps this will work with your new sim but if you try anither sim not used in thatphone bofore it will need code doing again

It shows Sim Error or else Invalid Sim...Or even though Sim Inserted it asks "Insert Sim"
If it says anyone of the error like that means Your Mobile is Locked To Network ..You need T Unlock it to insert other Network Sim GSM Sim Card....
It may locked to some Network....You can get the code here
http://www.superunlockcodes.com/supported-phones/rs12wp7/ and Unlock the Mobile from the Network Lock....
I hope..You got solution...

If it says Not valid or Invalid Sim Or else Sim error...It may locked to some Network,you need to Unlock it...To Unlock the Mobile,get the code here http://www.theunlockarena.com/nokia-e63/rs13wp9/
and Unlock it.

It may Due to Network lock...it will show like "Insert Sim".,Sim Error",Invalid Sim",Insert Sim" this resembles it locked to some Network,You need to Unlock it...You can get the Unlock code at reliable cost at here
http://www.mobileunlocksolutions.com/samsung-monte/rs1wp9/ and unlock the Mobile from the Network Lock.

it needs an unlock code. you may have to purchase one or ask your provider for one. the procedure on how to enter it and where to purchase it can be found here.

i have this model benQ-SIEMENS JASB1A ....2 things it is locked and 2nd i don have any sim card right now ...but i want to operate with different simcard.. plz send me sim code

Is this phone from the same service provider as your simcard? If not, not all phones are unlocked to work with the sim cards of rival companies. If both the phone and sim card are from the sam company, then you can have the company replace your sim card. They usually do this for free as a courtesy as long as you explain the problem to them. Hope this helps