I use to remove my digicel sim from my ipad4 AT&T + cellular, place it in an iPhone 4s ......activate a data plan, then replace it in my ipad4 and I was able to access digicel data services......but since of late I'm unable to do so.
Although Before I remove sim from iPhone I always test for data service but when transferred back to ipad4 no data service is available.

I'm in dire need to have this issue resolved....thnx