Iphone 4 network not available

There is more than an issue to cause this. 1st that some iphones are locked on a specific operators, with a contract for one or couple of years. after end of contract you can unlock the iphone at the operator and can use any sim card. 2nd the sim card it self may be damaged & cannot be read by iphone, please try it in another phone and see if it is working.
To know if your iphone is officially locked/unlocked by the model number, you can google it.

Hi if your iphone 4s is not accepting your sim card whether it is displaying messages like sim invalid ,sim lock and so on once you insert your sim in it then it mean your iphone 4s is locked to some other network provider due to this it wont accept your sim until you unlock it .You can easily unlock your iphone 4s using sites like WickedUnlock.com here they are rendering remote unlocking service to unlock all model iphone from network lock ...You first check that whether the service is available for your country and network provider .If yes then pay for it and unlock your iphone 4s then freely use it with any GSM sim .

what's your Exact Alcatel phone model?
You can get your phone unlocked from Network lock using unlock code.Unlock code is best way to unlock phone.You can get such codes from your Network service provider or any third party online vendors like Unlock-Zone.com here you need to specify your country,IMEI number of your phone.You can also have a lookup at free guide MobileUnlockGuide.com using this you can unlock your phone from Network lock easily.

Hi whether you want to unlock your iphone 4 from network lock then visit wickedunlock.com here they help you unlock your iphone using remote unlocking service.

If Your Phone Is Locked From Network . You Can Unlock Your Phone. Call Your Network Provider To Ask Your Phone Unlock Code. But your Network Provider Takes Time To Give You Unlock Code. If You Want Your Imei Unlock Code Instantly. Buy Phone Imei Unlock Code From Third Party. Many Site Available Online To Provide Imei Unlock Code.
I Hope This Will Help You.
Thank's

As far as i know your unlocked iphone will work with any network except 3, for some reason 3 use a different bandwidth or something never understood it but its been the same since 3 first can out. Best thing to do is get on a better network i.e orange or vodaphone.

Cheers

hello i had they same problem it means vodafone hads blocked it the person ou brought it off reported it stolen

try asking your operator. they must know how to solved it.

I bought this off ebay never worked for me,but try it you never know..............................

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,
so it won't ask for network password and shows "Insert SIM" message.
Now put the battery ,and switch the phone on .(phone shows "Insert SIM" message.)
3.With out turning off the phone push the sim fully in. At this stage the phone is still 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#
(star 7465625 star 638 star 8zeros star 8zeros hash)
7. Now Disable network lock By typing: #7465625*638*00000000#
(hash 7465625 star 638 star 8zeros hash)
Phone is unlocked (check with *#7465625#)

visit howardforums.com and search for the solution to cid/sim unlock the mda.