Will my iphone 4 work in Scotland while I'm on vacation?

I live in Texas and I'm going to Scotland--will my iPhone 4 work?

Added (1). I just learned I will be able to connect through Wi-Fi. Does that mean I can use twitter?

Your phone will certainly work here but if you use your US SIM card you'll pay roaming fees for calls and data, which could be quite expensive - depends on your carrier.

Wi-Fi should be fine though, so yes you'll be able to use apps like twitter.

Yes- we even have electricity (tour Iphone charger should be multi voltage and should just plug in to an adaptor.

The mobile market in the UK is much cheaper than the US. You should be able to get a UK sim for £1.00 and top it up, this way you could use data and calls without major financial problems.

North American uses different GSM wavebands from the rest of the world for mobile phones so check first what bands your phone uses so you know whether or not it will connect. If Wi-Fi gives you internet access, of course you can then tweet.

You might want to look into getting a UK SIM for the trip or your roaming charges will be enormous.

But all this is no good if you can't charge the thing.UK mains voltage is 240V, double what it is in the US, and the plugs are a completely different shape. So you need an adaptor to be able to charge the phone from a UK 3-pin socket and if your charger isn't multi-voltage, a converter for that as well. Push 240V through something only built for 110 and it is liable to overheat and catch fire! Instant fried phone - not a good idea.