Hi Joe, you said you had an iPHone so for starters can you try the follwong to get connected
1 - Can you disable 3G/4G on your handset and try connecting to a network.
2 - If above fails, go to the Settings/Phone/SIM Applications and select When Abroad/Network Selection/Manual/International - Roaming profile. Then search manually for a network and try to connect. Any Network will do
Could be this.
Unfortunately Apple don't make it easy to use iPhones while roaming on some networks.
Hope this helps.
My post crossed with Kevin's.