I'm off on holiday to Thailand on Tues.

I've downloaded a bangkok city guide app onto my phone and it has a GPS function which shows you where you are on a map and what sights, restaurants etc you are near at any given time.

If I use this app am I going to come home to astronomical charges on my phone bill? I was going to take my sim card out of my phone - will the app work then??

I've got Nokia on a virgin contract I get some free downloads a month bit I'm not sure how many - I've never exceeded it though.

As you can see I'm a bit of a numpty with all this so any info would be great.

i would assume its going to use data access - the android app looks like it does for some features.

two options:

1) Disable data roaming to make sure you dont end up with a hefty bill (i always do this) - you can still use wifi if you find a free wifi zone.
2) Speak to your service provider and see if they sell roaming packages ?

i always find it frustrating as holidays are the time that you really need to use some of these apps but roaming costs are just stupid