How to make an automated service for receiving SMS messages online?

Question

API

How to make an automated service for receiving SMS messages online?
What is required for this besides sim cards?)

Answer 1

Everything is simple. Take a modem, a program that receives messages and adds them to file logs - daily logs like "smslog-24-05-2018.txt" for each SIM card are stored in their own folder.
and then a program that displays these files as a page.
A program like this smsenabler.com
(I myself would write how to pay)

Answer 2

1. take a bucket of sim cards
2. buy / assemble the hardware: gsm-gateway(s) + sim-bank(s), so that all sims are not inserted into the gateway by hand. at the same time, the gateways forward incoming SMS automatically to your central server or the central server constantly interrogates them
3. create a central server for storing SMS
4. create a client part that will show clients only their SMS (i.e. those who came to the numbers that they received for use) + billing (if needed)
in short: in addition to SIM cards, you need equipment for installing SIM cards and converting SMS to the desired data format, as well as software that will store this data and interact with the end user
many components of this solution exist as open source free projects, or have a low cost