Hello, I'm scheduled to get on a business trip to US for short period and was wondering if there's any apps that I could get free phone number and save me from purchasing a sim card. I need the number to contact clients or make some booking here and there and expected to fly there every now and then. Each stay will probably between a few days or a week. My friend in US recommends me an app called WhatsCall *link removed*and says they just released this new feature which people can get free phone number and it's also free to use this number to make calls between US and Canada. Has anybody used this before? Any advice?