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have a talk to your telco about this SIM cards come in different sizes too most common is nano
its Safeer from Justanswer Tech Expert here to assist you.
if you are able to connect mobile to computer, please use the following url for remote session http://www.justanswer.com/remotedesktop/join.aspx?Session=f57cdb5d-09dd-4336-87c1-55d3d86c53eb
its an country or SIM locked to a single network issue, meanwhile you can get the Unlock code from the following website as advertised https://unlocklocks.com/