My father in law is up from CHC, and has an iPhone 4 he's been using for ages. About a day and a half or two days ago (it's hard to get specifics) his phone disconnected from the Vodafone network and will not reconnect at all. We swapped the sim with my brother in laws Spark sim and it worked just fine. When we popped the VF sim into my brother in laws Nexus 5, it worked just fine. So it seems to be an iPhone/networking issue. Have there been changes in/around Brown's Bay which would cause this? It seems a bit strange.

He will upgrade his phone if absolutely necessary, however he's up there in age and used to how the iPhone works and likes the size as it fits nicely in his pocket. Just curious what else I should be trying with him, or if it just needs to be upgraded. Cheers.