ORANGE V EE
I can only agree with you. I'm one of those who has not upgraded, using 3G to connect on the internet is a painful and slow experience using an iPhone 5S. It will only connect 60% of the time.
Also I have been getting an increasing number of failed calls for instance in Sussex last week I was unable to make a phone call for three hours during the day because of 'call failures'.
I also get quite a few messages through telling me I have had a missed call, yet the phone next to me has never rang of indicated someone had tried to phone.
Yet using a 3 mobile card in my iPad mini I get far faster and more reliable connections even though both phones show full signal strength.
Using Orange feels like going back to old dial up internet. Personally I think Orange have nobbled the system in the hope people upgrade.