Popcorn Mobile for Nomad that works for US company

Hello,

I work for a US company and need to make a lot of calls (I’m in sales) to various people in the US daily. I have Mint currently, but the minternational passes are a pain.

I live in Spain and have Movistar as my main sim for data, so I am worried less about data usage in Spain than I am about calling, texting, and roaming data.

And before everyone talks about it being expensive, I can afford the $70 per month with ease, so that’s not the concern. I am curious if the service is good in various European countries, the Middle East, and the US (and Thailand and Singapore for a one off trip). Is the coverage going from place to place very good, and have you experienced any problems?

Thanks in advance