no signal after moving abroad

hi everyone... im from portugal andi have a 3gs 4.1 jailbroken and unlock and now i move to england for work and my phone has no signal here with my portugal vodafone sim or england o2 sim.... can any one help me with this?

thank you very much

What tool did you use to jailbreak? What tool did you use to unlock? What versions of each?

Let us know and we can start to help.

its was done before the new year with the latest version redn0w and ultrasn0w

I hate to be a stickler, but 'Latest Version' is pretty much the absolute worst possible description you can provide :) I don't know whether you mean the latest version now, the latest version before the new year (of which there could be 13), etc. If you don't mind, please determine what actual versions you used -- that will make it a lot easier to help!

Thanks,

hi i used redsn0w 0.9.6rc8 and ultrasn0w 2.1

also i have the 06.15.00 baseband

Have you tried disabling 3G in the phone's settings? Vodafone uses 900MHz and 1800MHz, and the iPhone does not support the 1800MHz range. I believe the same is true for the o2 radio frequencies as well. As such, the phone will be incapable of connecting to 3G in those areas, but will continue to try (and show no service or zero bars) until you turn 3G off in the settings on the phone.

yes ive tried that but still nothing

Did you reboot the phone after turning 3G off? Sometimes people report having to toggle airplane mode or reboot after disabling 3G and inserting the alternate SIM.