Import Contacts from gmail.
Instead of sending one mail to one person send to multiple ppl.

If you add friends on the web from the + add icon on the friends list, you can pull data from your gmail contacts and send invites to a bunch of people.
Marshall
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Boopathi K commented
contact names and mail IDs are there but no phone numbers imported,
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Venkat commented
No Sir...this feature doesn't help on Android App. It pulls the Names from my Contacts but doesn't pull the associated phone numbers.
I have to feed in the phone number or email address manually for each contact I add.
Needs more improvement
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AdminSplitwise Support (-, Splitwise) commented
We are currently working on various ways to better integrate your contacts into Splitwise from other sites. I don't have a hard date, but finding contacts via other networks will be live in the very near future.