need to get cellphone/internet service in a steel building

Have a building that needs internet access and the the people that were inside said that using their smartphones would be fine.  Here is the problem:  The building is steel and they cannot get cell service AT ALL.  So of course no internet with phones.  Is there a solution to this by placing an antenna or something outside of the building and running a cable to a wireless router inside that the phones can hook up to WIFI?  Or is there a better solution for this scenario?  I was hoping not to have to pull in an internet line that is not there at the moment.
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Not knowing building size and number of users, a cell repeater could be used.
So there is no internet connection at the building at all?
The outside wireless antenna would work if one can hop on to someone elses system.
mkramer777Author Commented:
No internet service or cell service.  Nothing.  Can't make a call.  Not sure what this building is made of other than steel and concrete.   How would a cell repeater work?
mkramer777Author Commented:
I meant there's no cell service in the building. Outside the building it's fine. I will take a look at the links.
Tanja SchaferHR managerCommented:
This is an urgent issue for many modern companies since iron-concrete partitions between floors constantly interfere with cellular network signals and Wifi. The best way to fix the problem, only the use of access points on each floor separately (if it is a wireless Internet) and the installation of a cellular tower (transmitter) for a quality and constant signal. There is a good example of companies or rather a modern "spielautomaten hersteller", they have offices equipped according to special requirements so that the construction of the building does not interfere with the operation of all devices that in one way or another are related to data transmission.

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