SOURCE: invalid sim
zim card has ben expired,or phone is'nt open line,go to the certified technician.
SOURCE: dual sim china mobile show on screen invalid sim
I HAVE A CHINA SET SIGMATEL S90 DUAL SIM ONLY SIM 1 IS WORKING FOR SIM 2 SHOWS AS INVALID SIM FROM FEW DAYS PLEASE SOLVE THIS PROBLEM
BABU
9035040544
SOURCE: Invalid Sim
If your phone is locked to your original sim card, you will not be able to use any other. contact your provider and see if it is in fact locked. Many phone providers lock their phones.
SOURCE: invalid sim
Ok, this sounds f**king stupid, but, try this
-Dial *#000#
-change the date to one in the past
-switch phone off then on
-change the date back to present
-switch phone off then on
This worked for me.... don't ask me why i even tried this
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