NO NETWORK COVERAGE

SOURCE: no network coverage

Phone is not receiving any radio signal / received signal is too weak:
Confirm that network coverage is available where you are by contacting your service provider.

SIM card is not working properly:

Insert your SIM card into another phone
Note: Contact your service provider if you get the same message again.
Phone is not working properly:
Insert your SIM card into another phone. If the second phone works with the inserted SIM card, then
the problem is probably with the first instrument.
Note: In this case, contact your nearest Sony Ericsson service center regarding your phone problem.

SOURCE: Network problemin Sony Ericsson W380i where as the same SIM card in NOkia works fine

It is better to replace your phone with new one as you have bought recently. contact your retailer.

SOURCE: hi my sony c903 has all of a sudden showed no

Hi! I went through this tonight with my Cyber Shot too. There's a software update you need to install from the Sony Ericsson site. I've got the link to it and the information about it here on my blog - http://jackcullen.blogspot.com/2009/12/sony-ericsson-c093-dilemma-network-3.html

Thanks,

Jack

SOURCE: my phone has no network coverage problem

it is a common sotware fault with all sony erricsson and other phones its the software what the companys put on aint all that its cracked up 2 be i would recomend a re-flash if that fails then take it back to your provider

Testimonial: "i got the software changed but it happens again..."

SOURCE: i cant get any network coverage on my sony

The Sony Ericsson cell phone could be locked to a particular phone service provider. In this case it needs to be unlocked from this phone service provider before it will work with your SIM card.
To get the security code to unlock the cell phone from the current cell phone provider so you can use it with a different phone provider, Please click on this link and follow my instructions :-
http://www.fixya.com/support/r4049238-unlock_cell_phone
If your phone provider does not help you then this WEB site it provides security codes for a small price.
http://www.mobileunlockstore.com/?gclid=CKDb2_y2558CFSlJagodxBkDHw
Try this WEB site also - Unlock Free
http://www.unlock-free.com