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So I've got a website that serves ~1000 users, coordinating scheduling for events. I'd like to enable our system to send SMS messages to users. I have access to the server and would like to purchase and install a GSM modem instead of subscribing to some SMS Gateway service. What I gather so far is that I need to purchase the modem, and obviously a SIM card for that modem, and then a subscription for that SIM card.
Question 1 probably shouldn't go in StackOverflow, but I'll ask just in case... Do cellular service providers usually have unique subscription plans for companies or organizations sending bulk SMS messages?
Question 2: What kind of software is needed for gsm modems? How does one access the modem? Our server is a conventional LAMP architecture, site written in PHP. So... forgive me... but... how would I utilize the GSM modem? Options? Best practice?
Edit Some other posts link to this post, why does it not include a GSM modem? Or am I reading this wrong.
Edit This post refers to SMS Aggregators. What are they and where do they fit within the modem or gateway decision? Edit Oh. Just another word for SMS Gateway.