We will be traveling for one month in May/June 2014 though Germany, Croatia, and Slovenia. We will be in Germany a few more days than the other two countries, but fairly evenly divided. I have an unlocked Verizon iPhone 5s and can switch out the new nano-SIM card for another. I will use the phone for calls and texts in/between the three countries, with an occasional call and text to/from the USA. I also will most likely use 2-3 GB of data during the month in the three countries.
I would love suggestions for the "best" (I know the market changes rapidly) nano-SIM to purchase for the one month period for the purposes stated. Thank you.