GSM operates in '''licensed frequency spectrum''', i.e. the license to operate equipment on the GSM bands is granted (typically sold/auctioned) to commercial entities.

This is ''very different'' from technologies like Bluetooth or WiFi operating in the 2.4GHz unlicensed ISM band.

As a result, you cannot operate any GSM RF equipment (like the [wiki:BS11 BS-11] or any other BTS) unless you have obtained
a proper license from the regulatory authority in your country. Accomplishing to operate a BTS without having such a license is subject to punishment according to the respective laws in your country.

Apart from the legal aspects, there also are practical aspects. If you operate on a channel (ARFCN) that is already used by a GSM operator,
you will likely create interference with the production network. '''Please don't do this!''' It is illegal and disruptive, and not
related to what this project is trying to achieve.

Regulatory authorities for GSM licensing

• Austria http://www.rtr.at

• Belgium http://ibpt.be/

For testing, the authorization category 1b and 6 are relevant. The GSM900 band is fully licensed to commercial operators, so only ARFCN in the 1800 band will be allocated.

• Germany: http://www.bundesnetzagentur.de/

• Netherlands: http://www.agentschap-telecom.nl/

• Sweden: http://www.pts.se/en-gb/

• Switzerland: http://www.bakom.admin.ch/

• United Kingdom: http://www.ofcom.org.uk/