SMSchat app allows you to run SMS and WhatsApp campaigns with your phone as the sending & receiving gateway
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”The law allows you to use your own SIM for business messaging”
Can I send SMS and still be GDPR compliant?

YES; if your message is of transactional nature (i.e. an appointment reminder, delivery notification, business continuity or staff rostering), or a marketing message intended for people with whom you have an existing customer relationship, you can send SMS without needing consent (you must, of course, provide an opt-out on all marketing messages).

When it comes to people with whom you
do not have an active customer relationship, text message communications fall under the same PECR requirements as email marketing communications. You should get permission from prospects to receive promotional SMS prior to any sends, as well as providing opportunities to change their preferences
and opt-out.

How many messages can I send in a month?

Per most telecom operators’ fair usage policy you should be able to send up to 5,000 SMS per month on a single SIM card. Always check your operator’s fair usage policy first. If you want to send more texts, you can get another SIM contract.

Download the SMS chat android App
Developer? Browse the SMSchat API
Integrate SMSchat and WhatsApp services into your software in minutes and enjoy live two-way SMS/WhatsApp conversations where your SIM card(s) perform as SMS gateway.
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Unofficial WhatsApp Api
SMSchat is an unofficial WhatsApp API for developers that allows businesses to send, receive, and manage WhatsApp messages programmatically. The platform offers a range of features which can be tested by developers during a free trial to explore its features.
Engage via bulk SMS/WhatsApp
with your chosen chatbot builder platform Manage your contacts and send bulk SMS
in one easy-to-use interface. Upload contacts from the supported file formats, create groups, you can send SMS to groups
or individuals. Also schedule your SMS messages – appointment reminders, promotions and notifications to ensure that messages are sent at a specific date and time.