libphonejs - how to use it?

I've got the following attempt to send an SMS

sendText: function(phone, callback) {
        // maybe needs a .then() ?
        var formattedPhone = Phone.format(Phone.parse(phone, 'US'), 'International_plaintext')
        var messageBody = 'test'
        client.sms.messages.create({
            to: formattedPhone,
            from: number,
            body: messageBody
        })
    }, function(error, message) {
        if (error) {
            console.log("SMS ERROR sending to: " + formattedPhone)
            callback(error)
        } else {
            console.log("SMS sent to: " + formattedPhone)
            callback(null, message)
        }
    }

It doesn't print an error or a success string to console - is it the Phone.format(Phone.parse()) call that's causing it by blocking the thread or something?

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