Data services not working when travelling abroad

[MichaelMa]

I recently travelled to Argentina and Brazil.  I purchased the Travel bolt-on before I left.  This worked for calls and texts, but not data.  Even though I had enabled data roaming on my iPhone 5S I kept getting a message that I was not connected to the data service, so couldn'r receive emails or browse the web.  Why should I have had these problems?

[MI5]

Having the 4g switch on can cause problems on some foreign networks but you might also have the wrong data bolt on.
What is your data apn in settings?

[MichaelMa]

Data APN is idata.o2.co.uk. I also tried toggling between 4G and 3G, however this did not help...

[MI5]

Call customer services and ask them to check if you are on iData or standard data.
If you've previously had a different phone or swapped sims/upgraded, it could be wrong.

[Marjo]

Hey @MichaelMa Where in Brazil did you go to? It's still on my to-do list for the future! Did you manage to find out about your data in the end?

[MichaelMa]

We went from Rio to Manaus by cruise ship. I didn't solve my problem but you could follow the advice above to see if it helps. PS - I am reluctant to call the helpline as it is always such a long and usually unhelpful process...