Does the sim card control the frequency transmitted? And does the transmitter in the phone allow for a large range of frequencies, like from below 900Mhz up to and past wifi (2.4Ghz)??
I am not a specialist in GSM networking, but I went looking at the relevant standards documents to see whether I could answer your question.<p>It appears that the handset can request information from the SIM about frequency bands. For example, see section 10.3.38 of 3gpp specification #11.11 "Specification of the Subscriber Identity Module - Mobile Equipment (SIM - ME) interface", which discusses EF_CPBCCH: "CPBCCH storage may reduce the extent of a Mobile Station's search of CPBCCH carriers when selecting a cell" <a href="https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=419" rel="nofollow">https://portal.3gpp.org/desktopmodules/Specifications/Specif...</a> [click 'versions' and then the link '8.14.0' to get a zip of a doc file that renders like hell in libreoffice 5 on debian stretch]<p>However, after that I lose myself in random standards document and can't give a clearer or more authoritative answer.
The SIM card doesn't contain the radio, the phone itself contains the radio. Phones can only transmit on a fairly narrow set of frequencies, you can't tune one to an arbitrary frequency in the gigahertz range.<p>If you want to transmit on an arbitrary frequency you'll need to buy a software defined radio, like the HackRF <a href="http://www.kr4.us/HackRF-One.html?gclid=CJGdyMDLqtQCFYGUfgodhdkE_A" rel="nofollow">http://www.kr4.us/HackRF-One.html?gclid=CJGdyMDLqtQCFYGUfgod...</a>