About two weeks ago I bought an AIS SIM card at MBK and have been using it to call other mobile phones and land lines without a problem. Just today I tried to call a number and all I got is the typical three tone your-number-cannot-be-connected sound that everyone's heard at some point, though without any voice message to go with it. This happens whether I dial mobile or land line numbers.

I'm still able to receive calls exactly as before and the phone seems to otherwise perform completely normally. I've also not dropped it nor done anything else that could have damaged it. The battery also has plenty of charge and the SIM has an available balance of 142 baht on it. I've tried switching the phone off and on but that made no difference. I've not yet removed and reinserted the SIM card but have considered doing so. But more so I'm thinking at this point that maybe everything is actually OK physically and instead there's some kind of registration or other code I need to enter to fully activate it -- that I had a two week grace period to do and this has run out. I simply bought the card with cash and never filled out any form or did anything to set it up. The guy I purchased it from put it in my phone and got it working for me.

Any ideas what's going on? Do I need to make a trip back to MBK and hopefully find the guy and have him service my phone, or even go to a Nokia service center, or instead get in touch with AIS?

Just an idea.

Check your settings to see if you have own number sending selected on. Sometimes selecting this function to off will prevent you making a call.

test what Farma wrote!

If it not work, enter the next AIS-Outlet and let them check the phone!

Check your settings to see if you have own number sending selected on. Sometimes selecting this function to off will prevent you making a call.

Thanks! It turned out to be something very similar to that.

Under 'Settings -> Call settings -> Line for outgoing calls' somehow Line 2 had gotten selected and I was unable to call out. Apparently having a Line 2 for outgoing calls has to be first specially activated with AIS (maybe at an extra cost) and I'd not done this. As soon as I switched it back to Line 1 I was able to call out again. Hmmm, I don't remember switching to Line 2 before and don't know how I could have inadvertently done this. Guess I'll have to switch the automatic keyguard back on to keep the keys from being pushed when the phone is in my pocket. Thanks again.