Wish I could give a better rating because the idea sounds good, but in practice it just did not work

Pros: never swap SIMs, App easy to use, rates comparible to local pre-paid SIMs, good coverage by country, excellent customer supportCons: No longer ship worldwide, Sticker very delicate to apply (when I got it - I had to get a secondone shipped as I ruined the first), Automatic swap tricky - I use manual switch, but that can lead to forgetting to do it!Get yourself the Knowroaming

Until then I can't give good rating to this product.

A word about rates they appear to be a middle ground between using my Verizon phone overseas (very expensive) and getting a local sim card (much cheaper) but for ease and simplicity the rates I felt were very good.

Slow data rates

However, the attractive rates of $0.09/min on T-Mobile increase to $0.29 /min.

First it worked as advertised, second the rates were reasonable and the ability to simply turn on my phone and have it work as soon as I landed was just what I wanted.

n’t lose my home (American) sim

n’t recommend KnowRoaming