Kaeleku,
There's no point in "harping" on Project Fi, as that option is useless for the majority of people as it only supports Nexus phones. According to their website....
"The Nexus 6P, Nexus 5X and Nexus 6 are the first smartphones that support Project Fi's network of networks. We currently only support these devices."
michael.j.peter,
There are several options you could consider.....
- If your company will pay for your roaming service, sign-up for that. That will provide one phone for confirming hotel reservations or emergencies, and since you're all travelling together that should be adequate. One point to note is that you would still be receiving calls (business or otherwise), and those sometimes happen in the wee hours of the morning from people that don't bother to check the time difference.
- You could also get the Verizon plan for your wife's phone, as that will allow you to keep in touch with her if you're separated. You didn't say how old your children were, but is it possible that they will either be with you or your wife at all times?
- If the children are older and may venture away on their own, there are several possible options......
(1.) Turn off data on the children's phones but leave the voice & text functions on. That would allow you to contact them if needed (or vice-versa) but the costs would be higher as you wouldn't be using the roaming plan. You'd have to check with Verizon for specific prices for occasional use.
(2.) If the children's phones are unlocked, you could use travel SIM's from iRoam, Cellular Abroad, Telestial, Mobal or other firms. The SIM cards range in price from about $10 - $30. Check the respective websites for details. These typically use a U.K.-based number and post-paid billing (calls charged to a credit card), so no need to top-up. These also offer fairly consistent rates across most countries in Europe. Using texts most of the time would be cheapest as received texts are usually free. Voice calls would be more expensive for them, as they would have to make an international long distance call to your number in the U.S. However, one caveat - it's best to leave data turned off when using a travel SIM, as data charges are often steep, if available at all.
(3.) Turn off all wireless functions on the children's phones except for Wi-Fi and use something like Viber to keep in touch using text messaging. Of course that would only be possible where they're able to access Wi-Fi. That would allow them to keep in touch with their friends or post on Facebook or whatever. However, one point to keep in mind is that Wi-Fi service can vary between countries and between hotels. In some cases it's good, in other cases service can be a bit "erratic" in some parts of the hotel, and in other cases it only works in the lobby area. In addition, if you're staying in the higher end hotels, they often charge for Wi-Fi service while less expensive hotels often provide that with the cost of the room.
As you can see, there are no solutions which are both easy and cheap. The simplest solution would be to just use the roaming plan provided by your home network, but that's also the most expensive. Do they have only a voice and text option at lower cost (keep the data switched off, and only use Wi-Fi)? The cheapest option would be to buy local PAYG SIM cards when you arrive, but of course all the phones would have to be unlocked. Costs and other details would depend on the network you chose, and which of their plans you opted for.