You raise some good points here.
For me my mobile data is free so I don't have to worry about costs. There is another way to get a unique IP per connection if you're in the UK. I won't go into detail but there is one ISP that gives you a dynamic IP address that is changed when you reset the modem. Again it can be scripted and only takes 1 minute to get back online.
I've never had issues with using mobile internet and the normal browser. I think because mobile dongles are used a fair bit by regular users they wouldn't be able to check for this.
Regarding the cookie swapper, thank you! I have never seen this and was tempted to code an extension that does just that. I'll do some searching today it will save me a huge chunk of time if I can switch at the click of a button.
I'm always skeptical about using bots. Are there bots that exist that do not trigger issues with accounts? I'd hate to load in all my accounts and have them all deletedI was tempted to code up a bot with CasperJS but just haven't found the time time.
Interesting methods discussed. Most providers have capped tethering allowances, like three for example, even on their unlimited plans. Do you trick them to think it's regular mobile data? I think I read something about that online anyway but don't know how it's done.
Tethering is capped on an OS level (e.g. max. number of devices you can share with), not mobile network level, because technically the mobile network doesn't even know that you are sharing the internet.
So does that mean if I only use it in a dongle and not a mobile and only on the same computer, the network provider wouldn't know any different?
In the case of dongles, the mobile network is the internet provider and they know the dongles are going to be used in laptops, desktops, any other devices with USB port.
Ahh okay, so is there any way round it? 'All-you-can-eat (30GB Personal Hotspot)' is how Three phrase it.
I still don't understand what exactly you want to get around of?! Bandwidth? No, there isn't any way around it, if your bandwidth consumption hits the limit (30 GB in this case), you won't have internet anymore or, depending on the network, you will have ridiculous reduced speeds of up to 128 kb/s, which is barely enough to even load an account's news feed in FB.