I hate acronyms NAP

Broadband and Internet Phones
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Acronyms are used to much

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NAP = No Acronyms Please
PDFPortable Document FormatIt’s a file format developed by Adobe in the early 1990s to present documents consistently across different devices and platforms. Whether you’re viewing a PDF on a Windows PC, a Mac, or a phone, the layout, fonts, and graphics stay exactly the same.
PSTNPublic Switched Telephone Network.The Old Telephone Network. The Old Telephone Exchanges and Old Copper Cable Infrastructure are soon to be switched off.
ISDNIntegrated Services Digital NetworkIntroduced in 1985 it promised great things with digital communication and data using copper cables. The communication gave extra features including more speech channels and the data side had basic speeds of 64 Kbps.
VOIPVoice Over IP (Internet Protocol)In simple terms, the new internet phones convert speech into a digital format which can be sent to another Internet Phone via the Internet.
ADSLAsymmetric Digital Subscriber LineOld Broadband Service provided on old Phone Lines. Both will be switch off permanently when the old Telephone Network is switch off.
MVNOsMobile Virtual Network OperatesThey buy wholesale from the main network providers and resell to their customers. So their coverage etc is the same as the main providers they use, but the selling prices may be different.