What is alternative to GSM module.
I don't want to use GSM module and Arduino Uno kit but want to send message .so I want the alternative to GSM module.
Where do you want to send messages? Text messages (SMS) or messages to Cloud?
You can use WiFi with Uno or Ethernet Shield with Uno -- You can upload data to any cloud using this. And if want to send Text Messages then along with two I mention above use IFTTT or Twilio service and you can achieve that as well.