To enter their phone number because you sent an SMS to them.
So if there are any costs for sending this SMS it’s on you.
There weren’t any infrastructure costs to sending the first SMS ever,
there shouldn’t be any remaining for the consumer today
unless you’re a real unfortunate soul.
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> So if there are any costs for sending this SMS it’s on you.
It's a $0/month e-mail service.
If the price of entry is a single text message, I think that's fair.