[freakinvibe]

If you take your VZW SIM and use it in Germany for data, it will get very expensive for you as you pay per MB. You should get a SIM from, for example, T-Mobile Germany with a data flat rate.

For Egypt and Israel, you can still use the SIM card but I would switch data roaming off and only sync once a day or via WIFI.

I am living in Switzerland, just near the border of Germany, so if you have more questions, just let me know.