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I have a Twilio trial account, and I've been testing a web app for receiving SMS. I've assigned a URL for the inbound SMS messages, and that's been working fine. So far I haven't encountered any limitations on how many SMS messages I can receive, how fast, or anything like that. I didn't find anything on the Twilio website about this, either.
What is the limit, if anything, that my trial account has on receiving SMS messages? I don't need to send a response to the SMS sender, so I'm not worried about the cost to send SMS, or the "Sent by Twilio" that gets appended to a sent SMS.
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Log in to the Twilio Console's Phone Numbers page. Click on the phone number you'd like to have connected to your Function. If you want the Function to respond to incoming SMS, find the A Message Comes In option under Messaging.
Get started for free with Twilio's SMS APIs Alternatively, you can use Twilio's Programmable Messaging API or the Conversations API to set up SMS for your business.
If you don't use your phone number for more than 30 days, we'll remove it from your trial project. If you decide to return, you can always pick a new phone number. If you choose to upgrade your project, your trial number will be carried over and charged monthly according to current Voice/SMS rates.
Two common reasons for this: You might be trying to send SMS from a phone number which is only enabled for voice. This list shows which Twilio phone numbers are SMS enabled. All other Twilio phone numbers are not capable of sending SMS messages.
Here's some information from Twilio's Twitter (dates back to March 27, 2014): https://twitter.com/twilio/status/449231807888621568
"There is no time limit, you can go at your own pace (unless you outpace $30) . More free trial info: http://bit.ly/1fo64aN"
You can check your current balance here: https://www.twilio.com/user/account/usage/primary
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