My wife had my T-Mobile Sim in her iPad in France. She got her mail and push notifications, but told me that she couldn't even do basic web surfing on it. While I was there, I never had a chance to use her iPad to check it out.

Tomorrow, I OS 9 is going to be released. I am thinking out loud here, but I'm wondering whether iOS is low-power mode might be the ticket. By stopping data access to all background apps , I'm wondering whether you can stretch the 128K to tolerable limits.