I am designing a website.I want to validate the mobile no. entered by the user on the registration page, by sending a verification code to his mobile phone. Can anyone give me pointers to how should i proceed with it??
There are two options, depending on your budget.
Option 1 - buy an SMS gateway and install it on your server. You can then call an API from your server-side script that will send an SMS - you will need to supply the mobile phone number and the text content. This is the more expensive option unless you have a lot of volume.
Option 2 - use an SMS gateway service. In this case, someone else operates the gateway and you call their API to send messages. You normally buy "bundles" of texts to use this, so the cost depends on the number of texts you buy.