How to Use the Cellular Data in sim card which is in gsm900a to create a hotsopt which can be used by devices like mobile, laptop, etc
GSM/GPRS is getting extinct in more and more places and performance is not really good for data, so not sure you'll get a lot of use for this
creating a router is not straightforward and you might be pretty limited with a small ESP8266 to build a WiFi NAT router
with an ESP32 you could look at this for ideas : GitHub - martin-ger/esp32_nat_router: A simple NAT Router for the ESP32
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