I want to sending bulk SMS with Twilio is this possible with Twilio exists API. I have searching few hours with google, but can't find acceptable answers. So, I decide to asking at here. Thanks in advance.
SMS and MMS Quickstart Tutorial
This sample is using a dictionary to send messages to group of people, see at following sample code in above link.
// make an associative array of people we know, indexed by phone number
var people = new Dictionary<string,string>() {
{"+14158675309","Curious George"},
{"+14158675310","Boots"},
{"+14158675311","Virgil"}
};
More Over as You have mentioned BULK Messaging I would like you to have a look at their policy of Do's and Dont's also at this link
and look for section Sending mass marketing or bulk messaging using Twilio long code phone numbers
Have a look at
Yes and no, yes you can send 'batch' MMS by iterating thru a list of numbers you want to send to, but if you plan on sending a lot, you are going to want to lease a short-code (for about $1000/month) in order to qualify for the higher sending limits.
With a regular number you can send at most one message per second. With a shortcode, you can up that to 30 messages per second.
You might be able to get away with low-level 'bulk' sms on a regular twilio number, but don't be surprised if you get shut down if you are spamming or violating the terms of use (see Boosters post above for the link).
来源：https://stackoverflow.com/questions/19418801/how-to-send-bulk-sms-with-twilio-api