Data roaming charges on 3G abroad using Viber app

My boyfriend has went away to Portugal for 3 months and has no wireless connection where he's staying so he has to use 3G on his iphone. He's topped up by £15 but i'm unsure how long this will actually last text/call wise (i'm guessing not long) so we downloaded an app called Viber which claims to be free texts/calls on wireless but he'll be using 3G so it will be using up his MB. Does anyone know actually how far £15 will go using MB abroad?

All i can find on the intenet is "The bandwidth rate during a Viber call is approximately 240 KB per minute / 14 MB per hour." and apparently 1KB per 1 text. This is like a foreign language to me though i don't understand KB/MB in the slightest.

He is on orange so I don't know if that has any impact on charges or how much he'll even be charged per MB/GB/KB or whatever, any help would be appreciated thank you

1GB= 1024 MB
1MB= 1024 KB
Basically GB, MB, KB are units for measuring data usage over the Internet but also the size of files on electronic devices. At the top you can see how many of each in the other one. So text wise it would take around 1024× 1024=1, 048, 576 Viber texts to use up 1GB on mobile data or around 73 hours of talking to use 1 GB.

To get information about how much he is spending on mobile data I would say to contact orange and explain the story and ask them how much it costs to use mobile data in Portugal.

Hope this helped

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