MMS Not Working

Sorry but for my app it has to be done with cURL

I have the same problem, but i use python.

My SMS app works perfectly, but when i try to send a MMS i get the phone number error

Can you both call thing this API and detect if your number support "MmsSender" feature?

Using the RingCentral Python SDK, the code is something like this:

from ringcentral import SDK

RECIPIENT = '<ENTER PHONE NUMBER>'

RINGCENTRAL_CLIENTID = '<ENTER CLIENT ID>'
RINGCENTRAL_CLIENTSECRET = '<ENTER CLIENT SECRET>'
RINGCENTRAL_SERVER = 'https://platform.devtest.ringcentral.com'

RINGCENTRAL_USERNAME = '<YOUR ACCOUNT PHONE NUMBER>'
RINGCENTRAL_PASSWORD = '<YOUR ACCOUNT PASSWORD>'
RINGCENTRAL_EXTENSION = '<YOUR EXTENSION, PROBABLY "101">'

rcsdk = SDK( RINGCENTRAL_CLIENTID, RINGCENTRAL_CLIENTSECRET, RINGCENTRAL_SERVER)
platform = rcsdk.platform()
platform.login(RINGCENTRAL_USERNAME, RINGCENTRAL_EXTENSION, RINGCENTRAL_PASSWORD)

def read_extension_phone_number():
  resp = platform.get("/restapi/v1.0/account/~/extension/~/phone-number")
  jsonObj = resp.json()
  for record in jsonObj.records:
    for feature in record.features:
      print (feature)

read_extension_phone_number()

That is why I asked you to check if your number support MMS.

You can cCURL to send a message. You CANNOT cCURL to get your number info?