Please cite the International Telecommunication Union for third-party use of these data. Monthly subscription refers to the recurring fixed charge for subscribing to the PSTN in US$. The charge should cover the rental of the line but not the rental of the terminal (e.g., telephone set) where the terminal equipment market is liberalized. Separate charges should be stated where appropriate, for first and subsequent lines. If the rental charge includes any allowance for free or reduced rate call units, this should be indicated. If there are different charges for different exchange areas, the largest urban area should be used and specified in a note. This indicator is expressed in US dollars.