I have two sim cards. One for sending /receiving messages and calls. And one for Internet surfing. The issues: Switching sim cards is super annoying, no matter which phone I use, the connection is always too bad to do serious Internet surfing (unless I'm in a bigger city, which doesn't usually happen.
Now I'd like to create a battery powered mobile router with badass 2g/3g antennas that takes a simcard to connect to cell towers and provides the internet through a wifi interface.
How bulky would such a thing be?
In terms of price and effort, would it make a significant difference if the device had to be able to allow multiple (2-3) wifi-'clients' to connect at the same time?
What kind of hardware would I need?
A Raspberry Pi? An Arduino? How big would the antenna have to be?
The device can weigh 4 pounds, I wouldn't care. It should simply fit into my pocket, have at least 14 hours battery life, have a stable 3g connection (even when i'm in a train or in a crappy town) and be a stable wifi ap. Oh and it shouldn't break in my pocket (just thinking about those super fragile tiny antenna connectors)...
I'm not looking for dual-sim phones or a new phone in general!