You can setup an URL per token to notify each SMS status change, this webhook will notify using POST and having the next JSON schema within the payload request.
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{
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"id": "5889b9a0710e94066d49dcf1",
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"clientId": null,
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"to": "+34666000000",
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"code": 0,
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"status": "delivered",
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"createdAt": "2017-01-26T09:56:00+0100",
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"eventAt": "2017-01-26T09:57:01+0100"
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}
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Possible status and status Code can be found in Status Codes