This link shows countries (outside the U.S) which are compatible with SMS for Groupme.
So how do I get started with SMS in these countries? Is there a PIN and a Groupme country number?
The link in description of question shows the countries and respective operators which are supported
Could you refine your question?
Do you currently have the groupme app?
I think that to start a group you need the app, then it's just add people in your contacts and if they're in a supported country then you can add them and if not, then you're out of luck :(
So how do I get started with specifically the SMS in these countries? Is there a PIN and a Groupme country number? If so , can you tell the GroupMe sms number for say, India?
Have you used Groupme before?
To start you need the app on a smartphone, when you add people to your group they're texted by groupme, that's the number for the group.
That webpage says that you'll be charged international texting charges, so even if they do support your country, in this case India, if you want to use the non-smartphone version you will be using international texting.
International Text Messaging Fees
GroupMe is a free service provided by Mindless Dribble Inc., but any text messages sent/received are subject to standard text messaging rates determined by your mobile phone carrier. Additionally, text messages sent/received count towards a monthly quota as any other messages do. Any users, whether sending or receiving text messages with GroupMe, should be aware that standard text message rates may apply. Please be aware that texting charges can fluctuate internationally. Text messaging rates can normally be found by asking your provider.
Please also note that GroupMe currently uses US-based numbers. Every text message sent to or received from a GroupMe number will count as an international text message sent to or received from the United States. Please check your provider for the associated rates.
there's a link at the top of the page of the website you linked to that has this.