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I have had this same problem since 24/6/17 (on Android rather than iOS though) and am struggling to get it resolved by Vodafone's third level Tech Support. It's been established that the problem is at Vodafone's end, and not phone dependent.
I ring to progress the matter but get fobbed off with "Oh it's a 4G issue, we are woring to fix networks in your area."
My husband has one digit number different to me, the same phone model and bundle and his mobile data is fine.
Please could you contact me to help as I am despairing getting this sorted after two months!
I have the same issue in the USA. Phone says 4 G strong signal. Tried resetting everything.
Phone worked fine for data roaming in Italy last week and Germany week before.
I had a text from Vodafone telling me I am in one of the roam further destination so I can use myUK plan for £ 5 per day.
tried ringing 191 which was less than useless as the menu option 4 for problems abroad ended up trying to sell me Vodafone international.
Last time in US 3 months ago I had no problem.
This problem has started happening to me since Thursday 23rd. I'm on a £10 big value bundle and my data ran out a day before the bundle ended. I text the number to renew my bundle early which all went through, if I call 2345 it tells me my bundle is active with data available, but I can't actually use any data. No websites or apps that use data will load. I have a 4g icon showing I'm connected, and I've tried my SIM in a different phone and a different SIM in my phone to confirm that it's a problem with my SIM.