Ive recently used a smartphone in Holland, this is what i did/suggest you do to prevent data charges:
Get a pay as you go sim, at the moment vodafone UK offer a £2.00 for 25mb per day offer while in Europe, once you start using data your charged £2.00 but you then have 25mb to use, alternatively get a local Dutch prepaid sim card if you can access a shopping area vodafone Netherlands offer a pre paid smart phone sim with 1GB of inclusive data for €19.99
Put your contract sim card in an old non smart phone.
Before you go, look at how much data you use, and how you use data, there are plenty of data counter apps out there, and you can also get an app that will turn off mobile data completely ( quick settings for example) or if your android Rom supports it data can be turned off from the notification bar, the cyanogen mod7 version of Android supports this, as does ( i think) MUIU
Ways to reduce your data and other costs:
- Use a data freindly browser opera mini uses a proxy server that reduces the data size on images, graphics and other such stuff on websites.
Turn off background sync, and automatic e-mail updates
E-mail, dont text. Reply to text messages via e-mail, a standard text e-mail uses a tiny amount of data, and that tiny amount will cost less than a text, if youve turned off auto sync on your email it should be possible to send emails without receiving them.
Want to e-mail photos, again you can reduce their size, the reduce photo size app will cut the file size of photos on your phone, i sued 640x480 to send photos via e-mail, its not print quality but good enough to email, its also generates a much smaller file to add as an attachment.
Use Wifi - its cheaper and usually free theres plenty of free wifi in Schiphol airport.