No, it requires a data connection to locate the device. Same thing happens when you turn a wifi iPad or iPod off. Find my iPhone is unable to locate it. Just get a prepaid SIM card while you're in Amsterdam. I'm in Iceland right now, been here for a week. When I landed, my Verizon iPhone 5 picked up Vodafone and began roaming, obviously. I turned data roaming off until I was able to grab a prepaid SIM card from Síminn. I was able to buy 5gb of data for $17, and the price of the sim card came with about $15 worth of phone call/SMS credits. Definitely can't beat that vs roaming fees.