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E61i - Connection error in “Dual mode”

Posts: 8

E61i - Connection error in “Dual mode”

Yesterday, after 2 months of normal usage, my E61i, settled on “dual mode”, stopped to work.
On the screen it appears instead of “3G” the symbol of an antenna (GSM connection) without the name of the operator.
If I try to make a call it doesn’t work and it gives “connection error”. When someone calls me, it gives the message "phone is switched off".
If I set the phone on “GSM mode”, it works but of course in GSM and not in UMTS (3G), and I need to use 3G in order to speed up the internet connection.
My Italian operator is Wind and if I transfer this sim in another phone (Nokia 6151 that is a more simple UMTS phone) the problem is exactly the same.
I tried to use a different sim Wind, and also in this case I have the same problem on both the phones.
With a sim of Vodafone all is ok.

Probably it is mainly a network problem, but I cant understand why the phone doesn’t switch automatically on GSM if UMTS signal is not present. The phone is not a “provider locked phone”, it is an original “Nokia” and it has been updated to firmware version 2.0633.65.01. The 3G signal was very good.
I’ve found a lot of posts concerning this problem, but the only suggestion is to change the network mode from "Dual Mode" to "GSM", and then back to "Dual Mode".
Unfortunately the above solution doesn’t work and consequently I’m starting a new topic hoping to receive some new suggestion in order to solve this problem.
Thank you and best regards