My new samsung galaxy s duos detects only the sim which is inseted 1st, Its not recognizing any other sim inserted in it. i tried the sim with other mobiles its working fine, but this phone detects on

SOURCE: Samsung SIM card issues!

you dont have to buy new sim...go to your nearest service senter. hardware failure.... sim sockets or sim ic... thats the problem...

SOURCE: I have a T-mobile sim and I need to unlock my Samsung SGH-D407.

WOW! what a process! I don't know how you kept track of all that but , good job! Try this. It's a maybe, but better than nothing,

TEMPORARY UNLOCK:
Put a non-accepted SIM Card and turn it on. Type *#9998*3323#. Press Exit. You will get a new menu. Select Malloc Fail.

In newer phones:
#*7337#

SOURCE: My Samsung SGH-t329 is not detecting any networks

That is because you will need to contact your current service provider to obtain the subsidy unlock code in order to use a different carrier's sim card or to use it internationally. The will provide it to you at no cost.

SOURCE: I have bought a Samsung

hi

check the sim card slot of your mobile. may be it get damaged . if so change the sim card slot.
this will fix the problem . and also format the phone .. this will fix the problem..

thank you

SOURCE: i have a new samsung mobile phone and i insert sim

Try unlocking sites