Hi.
I also recently purchased the Xperia Neo and have been experiencing the same probems with WCDMA/GSM on Vodafone UK.
I had a morning when I was not able to make any calls despite trying to switch off the network by selecting another then back to Vodafone but this did not solve it. The only solution was to switch to GSM only but then I lost also 3G Internet.
Iain
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