I've got my 7610 about 5 months ago.
The Version is
V 4.0437.4ch
15-09-04
RH-51
First of all,I put my GPRS Setting to -> When Available
( Settings->Connenction->GPRS->GPRS Connenction->When Available )
So instead of having an aerial icon for signal strenght meter,I have 'G' icon...
I've done it at the very first time i received my phone.
It went well just until few days ago....
As u know if u have 'G' icon,when there's network activity,the 'G' icon is slashed ( when receiving/sending sms,making/receiving phone call )
It started few days ago like this,the 'G' icon is slashed by itself & stayed like that ( the slash mark not disappear ) WITHOUT any network activity and when it happens I can't make nor receive any data call ( SMS/MMS/Incoming,Outgoing phone calls )
And it just happened today...My dad made a phone call to my mom's mobile because when he ring my mobile,it said " The number is not listed" ( or something like that ) then I looked at my mobile and...as I explained earlier.
The only way to fix that is to turn off my mobile,and it back to normal.
This is may not be serious,but it can be because when i put my mobile in my pocket,if that thing happens i won't notice it,u know there's no warning tone...
I haven't downloaded any bogus software or anything risky..
The only things i've downloaded into my phone are 3 themes from mobile9.com , ringtones ( via pc suite,not via wap ) , JJkeylock from this website ( but i removed it ) , and games from official nokia website. I downloaded all those things via pcsuite,not via wap..I've never downloaded anything via wap!
Hope that information is good to identify what is the problem.
Thanks btw