HT201328 My unlocked iPhone 4 shows "No Service" and after airplane mode turned on and off, shows "Invalid SIM"

I recently bought two iPhone 4 phones from my colleague in USA. He unlocked these phones from AT&T. But I did not test it. However, now that I am back to India, and inserted my Indian Vodafone SIM car, the phone shows "No Service" and if turn AirPlane mode ON and then OFF, a message comes as "SIM Failure", and the top left corner shows, "Invalid SIM".
Now, how do I confirm whether my colleague was successfully able to unlock these phones ?
What are the steps to make my Indian Vodafone SIM work ?
Any support appreciated.

Hello there Vicky,
Here is a great article for troubleshooting the Cellular connection on your phone. From article iPhone: Troubleshooting a cellular data connection found here http://support.apple.com/kb/ts3780:
Follow the instructions below for assistance with troubleshooting cellular data issues on your iPhone. After performing each step, please test to see if the issue is resolved.
Toggle airplane mode: Tap Settings, turn airplane mode on, wait three seconds, and then turn off again.
Restart your iPhone.
Ensure that your software is up to date:
Check for a Carrier Settings Update. Tap Settings > General > About.
Check for an iOS Software Update. Tap Settings > General > Software Update.
Note: Some updates may require a Wi-Fi connection.
Remove the SIM Card and reinsert it. Allow the iPhone to acquire the network again.
If your SIM card has SIM PIN enabled, try toggling it off: Tap Settings > Phone > SIM PIN.
Try another location. If a different location works, but the original location still does not, contact your carrier to report the issue.
Reset network settings: Tap Settings > General > Reset > Reset Network Settings.
Restore the iPhone as new.
Contact your carrier to:
Verify that the iPhone is properly set up on the account with the appropriate, current data plan.
Verify that there are no account-related blocks.
Find out if there are specific error messages in the carrier logs that could help determine why the issue is occurring.
In order to verify if the phones have been unlocked, the original carrier for them would have to be called.
Take care,
Sterling

Similar Messages

Maybe you are looking for

  • Data Link Properties wizard doesn't display correctly.

    Hi, This is Dai. I'm using Oracle DB. When I try to create configuration of Identity Center and to config DB connection, Data Link Properties wizard doesn't display required DB provider. The document of "SAP NetWeaver Identity Management Identity Cen

  • How to get price list line id for service contract line(subline)

    Does some one know how to find a price list line id for service contracts line (sub line)? There is actually a column in table okc_k_lines_b which is called price_list_line_id, but it looks like it is never used (all columns values are NULL). I have

  • Organizing Outlook moving sent items in conversation view

    Can someone shed some light on why in Outlook 2010 and now, since I have upgraded, 2013, sent items are not moved as part of the conversation?  If I have an email exchange and decide that I want to keep the conversation I click and drag the whole con

  • Mistake in the programme

    hi, i m quite new to java . Can u pls tell me the mistakes in the following programme in BlueJ (to get the day on the given date. //reference date=31 Dec 0000 Friday class datedays{ static String d;static int t;static int n2; public static void enter

  • Unable to make a copy of a physical disc

    I've created a blu ray disc via FCPX, and have burned a copy.  How can I make a disc image from the physical disc, so that I can make additional copies? I made a blu ray version of a video, and I have the blu ray disc.  I no longer have the original