| Rank | Country | Telephones - main lines in use density |
11 | San Marino |  701 Telephones - main lines in use per 1000 people |
177 | Sao Tome and Principe |  35 Telephones - main lines in use per 1000 people |
119 | Saudi Arabia |  160 Telephones - main lines in use per 1000 people |
186 | Senegal |  22 Telephones - main lines in use per 1000 people |
86 | Serbia |  268 Telephones - main lines in use per 1000 people |
| Serbia and Montenegro | void |
90 | Seychelles |  252 Telephones - main lines in use per 1000 people |
221 | Sierra Leone |  4 Telephones - main lines in use per 1000 people |
58 | Singapore |  403 Telephones - main lines in use per 1000 people |
100 | Slovakia |  214 Telephones - main lines in use per 1000 people |
54 | Slovenia |  418 Telephones - main lines in use per 1000 people |
197 | Solomon Islands |  13 Telephones - main lines in use per 1000 people |
201 | Somalia |  11 Telephones - main lines in use per 1000 people |
139 | South Africa |  109 Telephones - main lines in use per 1000 people |
| South Georgia and the South Sandwich Islands | void |
| Southern Ocean | void |
44 | Spain |  455 Telephones - main lines in use per 1000 people |
| Spratly Islands | void |
128 | Sri Lanka |  130 Telephones - main lines in use per 1000 people |
192 | Sudan |  16 Telephones - main lines in use per 1000 people |
116 | Suriname |  172 Telephones - main lines in use per 1000 people |
| Svalbard |  void |
174 | Swaziland |  39 Telephones - main lines in use per 1000 people |
10 | Sweden |  706 Telephones - main lines in use per 1000 people |
15 | Switzerland |  665 Telephones - main lines in use per 1000 people |
118 | Syria |  165 Telephones - main lines in use per 1000 people |
20 | Taiwan |  633 Telephones - main lines in use per 1000 people |
175 | Tajikistan |  39 Telephones - main lines in use per 1000 people |
218 | Tanzania |  5 Telephones - main lines in use per 1000 people |
140 | Thailand |  108 Telephones - main lines in use per 1000 people |
228 | Timor-Leste |  3 Telephones - main lines in use per 1000 people |