If I top up 5 pounds on orange will I be able to use 3G on my iphone?

I was just wondering as I'm going on holiday soon to Cornwall and I Don't have Wi-Fi.

It is Ee now. Orange merged with tmobile to create Ee.

I'm not sure what you get for £5.It is often a £10 top up which gives you the extras.
Why not ask Ee?

For about 5 seconds until you run out of credit! At 69p per MB they rip you off like nothing I have ever seen. O2 will give you internet for £1 a day…