WhatsCall-Good to get free US phone number?

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 (WhatsCall) and says they just...

WhatsCall-Good to get free US phone number?

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