Lg ku990 invalid usim card - LG KU990 Viewty

SOURCE: unlocked usim

you will have to purchase the unlock code.  There are several website that do this and it is about 30 dollars.  Make sure you use a safe and secure website.

SOURCE: my ku990 doesn't recognize usim

Is the phone unlocked, because if it is not, and you put a different USIM into the phone than what came with the phone, it will not work.

Hope this helps...

SOURCE: my mobile made by LG keep saying -invalid USIM card

This has alos happened to me, I put in the wrong pin 3 times, then as it was laste and it was asking for a puk, I turned the phone off to save the battery, when I turned it back on it came up 'Invalid USIM card' is there anything that can be done?

SOURCE: invalid usim card

unlock phones are so unperdictable...there may not be a fix for this issue..other then getting an AT&T phone....and even if u are able to get it to start working again more then likely u wil continue to have many more isses..mainly becuz of the network changes..for example....using 3g and 3g only...last year the AT&T network was stil using both 2 and 3g network and there was even a few 2g SIM cards being sold in stores...now it almost all 3g..which of course complicates many things...even if u own a 2g AT&T phone a 3g SIM card can be and will be used on that phone....with unlock phones running on the 2g network the issues with not having a SIM card where possible...it was still unstable when wanting to use data services....but voice services were possible...now with everything going 3g...its makes things alot more complicated with AT&T if using a phone without SIM cards...if ur phone has the fuction to beable to shut off 3g networking and run on 2g.(like the apple iphone has) then try that....good luck