Switching sim card

Hi is your Sony Ericsson E16i mobile is not accepting your sim card?. Then it mean your phone is locked to some particular network provider due to this you can't use your phone with other network sim until you unlock it .You can get it unlocked using sites like TheUnlockArena.com here they are providing unlock code for all mobile models....

You can get the Unlock Code for Sony Ericsson W995 at OnlineGSMUnlock.com and Unlock it from network lock easily.Then use with other GSM Network sim card...

To Unlock the Sony Ericsson W200I model phone use the unlock code.You can get the unlock code from the site Theunlockarena.com/sony-ericsson/rs13wp8/
and Unlock it from network lock....Then use with any GSM Network Sim card....

My Dear :

FOR INSERT SIM:
First All Check:
1.Confirm whether same sim card is working in other h.s or not.
2.Make sure the sim slot is o.k. only try these two.
3.If all the above steps fails, check the SIM card connector pins for damage.
if so try to get serviced.
4.if ur sim card is good then it is problum form sim card ic u have u raplace it with SMD.
u can make it jumper mean u can fix this prob with out sim card is for this contact.
5.take sim connector slight up by pin then cheak by inserting sim.
6.hot air gun on sim i.c. then cheak it.
Last Option:
IF make sure that the sim card hasn't been damamged at all sO Please You Go to Service
& Sim Office and Get the Duplicate Sim Same Your No From Office Oprator
Problem will Solved Quickly

3:
FOR: KEYPAD LOCK CODE

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.onlinegsmunlock.com/sony-ericsson-w995/rs7wp9/

sony k550i showing inserte tarjeta sim even if sim is correcectly inserted.what to do.

formate ur moble and card

Warning: Do not enter any wrong unlock unlock codes on your Sony
Ericsson W200i WALKMAN mobile phones. If you enter over a certain
amount of wrong unlock codes on your mobile phone, your phone may get
hard locked and sometimes become unusable.
1 - Switch ON your Sony Ericsson W200i WALKMAN mobile phone without any
SIM Card, 2 - Press the left arrow key/button once, 3 - Press the button * twice, 4 - Press the left arrow key/button once, 5 - The message "Personalize with MNC2" will appear, (or you will have displayed an unlock menu, select the lock you
want to unlock) 6 - Enter the Unlock Code.
If your Sony Ericsson W200i WALKMAN mobile phone does not have a left
arrow button/key(e.g. Sony Ericsson W950i) and on a few phones(not all)
that have a "JOGDIAL" you must press the "down arrow" key/button
instead of the "left arrow" key/button for step 2 & 4. We mean by "Down
Arrow" to direct the Jogdial down! In the Sony Ericsson W950i and some
other models, the down arrow button/key would be located on the side of
the phone.

Warning: Do not enter any wrong unlock unlock codes on your Sony
Ericsson W200i WALKMAN mobile phones. If you enter over a certain
amount of wrong unlock codes on your mobile phone, your phone may get
hard locked and sometimes become unusable.
1 - Switch ON your Sony Ericsson W200i WALKMAN mobile phone without any
SIM Card, 2 - Press the left arrow key/button once, 3 - Press the button * twice, 4 - Press the left arrow key/button once, 5 - The message "Personalize with MNC2" will appear, (or you will have displayed an unlock menu, select the lock you
want to unlock) 6 - Enter the Unlock Code.
If your Sony Ericsson W200i WALKMAN mobile phone does not have a left
arrow button/key(e.g. Sony Ericsson W950i) and on a few phones(not all)
that have a "JOGDIAL" you must press the "down arrow" key/button
instead of the "left arrow" key/button for step 2 & 4. We mean by "Down
Arrow" to direct the Jogdial down! In the Sony Ericsson W950i and some
other models, the down arrow button/key would be located on the side of
the phone.

Is your phone SIM locked or just power on locked? Be more descriptive.
If it says wrong sim / sim error etc then you need provider unlock code - if it is just regular code - it may be on your sim card