The thing about traveling internationally is that you have to get an international plan which has much less data. I'd start here:
If you need a lot of data your best bet is to buy a SIM card when you get there.
Yes, I've been to that site, but I couldn't see a way to add anything without changing my entire plan, and then having to change it again once I get back. I was under the impression that SIM cards couldn't be added to newer iPhones. How does one do this?
Nocreativescreennamehere How exciting that you’re traveling to India. We want you to have a great trip. Here are 2 International plan options which you can choose from:
$40 100 min, 100 sent msg / unlimited incoming, Data: 100 MB
$85 250 min, 250 sent msg / unlimited incoming, Data: 250 MB
You would need to speak with customer service and make sure your account is set for International use.
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I'm not super familiar with iPhones, but assuming it has a SIM card tray, you'd get a pre-paid SIM card over seas, put it in your phone and use it. It's exactly what some folks do when they travel here from over seas.