most bag phones were used in vehicles. i don't think many used the portable option. a bag phone is mainly a handset connected to its base/modem via a RJ-45 line and a battery plugs into the same base. the base contains the actual hardware and antenna.
There are a few old TV episodes showing microwave phones in them, and the distinctive tones when calls were placed or lost is heard in some old songs, the end of 'Another Brick in the Wall Part 2' from Pink Floyd has some microwave cell noises.
Sure what you're actually hearing in Another Brick in the Wall, is an old style operator connected transatlantic call with MF signalling, collect call as well. Doesn't it go, "This is Mr Floyd calling, are we reaching Mr. Floyd, will you accept the charges?"...or something like that, will have to give it another listen later.
When microwave phones were in use, these used to dot the landscape:
Those are actually microwave point-to-point telecommunications relay dishes, focused beam line of sight. And still a common sight now. These couldn't be for car phones,
because these generate a very narrow focused beam, and are definitely line of sight. AFAIK the old radiotelephone and car phones used VHF. These dishes are normally used for the distribution of TV, internet and telecoms, between the various central offices and switching centres.
This what BT Tower in London was built for in 1964, and it still serves the same purpose today.
EDIT:
Talking of microwaves, anyone in the UK, particularly in Anglia, remember something called Ionica in the late 90s?
Had one of these fixed to your chimney or wall?
It was a telco that had the clever idea of using microwaves, instead of the traditional copper local loop. BT had the monopoly on the local loop at the time. Good idea, except it didn't work as intended due to the fact it's line of sight, and the company went bust within a year. I know about this, because I went to work in Anglia for a few weeks, reconnecting ex-Ionica customers back to BT.
http://en.wikipedia.org/wiki/Ionica_%28company%29