NOTE: this is a clone/port of the Chrome extension version.
Built against the free & cool textbelt.com API, this extension allows you to send SMS text messages for free, without requiring any registration nor entering CAPTCHA codes. There is some limits on the number of messages you can send in a day and within a short period of time. See textbelt.com for details on limitations.
SMS support limited to carriers noted at textbelt.com.
Unfortunately, this service doesn't offer option to supply a reply number or address for recipient to reply to. But you can put that inside the SMS message if needed.
I built this extension since the service provider is only an API (for developers). Well, here's an extension for the everyday folks to use it, no scripting/programming needed.
Source code for the extension will be available at https://github.com/daluu/textbelt-clients
You can try to get support at the Github site link above. Bear in mind some of your support issues may be specific to the Textbelt API rather than the extension, so then I may not be able to help you in that case, contact the API developer at textbelt.com instead.
FYI, as a fallback, if this extension doesn't work for you or not to your liking, try AutoSMS client at Opera addons (https://addons.opera.com/en/extensions/details/autosms/?display=en).
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