No Network after intl roaming

I have both iPhone 3G and 3Gs, and everytime I took them traveling outside the country, the phone works normally using international roaming.
Unfortunately both 3G and 3Gs got "No Network" everytime I got back to my own country. I tried switching them off and on again repeatedly, but still got "No Network" messages. I had to reset to previous setting to make them get signal again. One time after coming back from Japan, one of my iPhone worked but still have "DoCoMo" instead of my country own network.
Does anyone have similar problem?

Yes , I live in SG and travel frequently to Malaysia and i face this issue EVERYTIME whenever there is a switch in network while roaming. I have to manually switch network when in another country and when I'm back to my home country. I see this problem on OS3 and now after upgrading to OS4 am STILL seeing this issue.
Have some experience in GSM Protocol and my suspicion is that Apple needs to work with their GSM/WCDMA protocol stack provided to iron this out.
Apple..comments??

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