Nexmo not sending SMS to US Number, but able to send to Indian Number

Curl for posting message to US number:

curl -X POST "https://rest.nexmo.com/sms/json"   -d "from=1XXXXXXXXXX"   -d "text=A text message set using the Nexmo SMS API"   -d "to=1XXXXXXXXXX"   -d "api_key=my_api_key"   -d "api_secret=my_api_secret"

Response:

{
    "message-count": "1",
    "messages": [{
        "to": "1XXXXXXXXXX",
        "status": "15",
        "error-text": "Illegal Sender Address - rejected",
        "network": "XXXXXX"
    }]
}

Curl for posting message to Indian number:

curl -X POST "https://rest.nexmo.com/sms/json"   -d "from=1XXXXXXXXXX"   -d "text=A text message set using the Nexmo SMS API"   -d "to=91XXXXXXXXXX"   -d "api_key=my_api_key"   -d "api_secret=my_api_secret"

Response:

{
    "message-count": "1",
    "messages": [{
        "to": "91XXXXXXXXXX",
        "message-id": "0F000XXXXF05XXX6",
        "status": "0",
        "remaining-balance": "48.96XXXXXX",
        "message-price": "0.00800000",
        "network": "XXXXX"
    }]
}

This was working fine for both US and Indian Number, but recently it is giving me Illegal Sender Address - rejected error.

Has nexmo changed anything?

Solution

Please see this page for restrictions on USA SMS features: https://help.nexmo.com/hc/en-us/articles/204017023-USA-SMS-Features-Restrictions

Specifically:

"All SMS sent to the US must originate from either a U.S. pre-approved long number or short code that is associated with your Nexmo account. Alpha sender IDs are not supported."