| City | Area code | Phone number length | Type of connection |
| Oderzo | 0422 | **(****) | Phone |
| Oderzo | 042201 | (****) | Phone |
| Oderzo | 042203 | (****) | Phone |
| Oderzo | 042208 | (****) | Phone |
| Oderzo | 042220 | (****) | Phone |
| Oderzo | 042250 | (****) | Phone |
| Oderzo | 042271 | (****) | Phone |
| Oderzo | 042274 | (****) | Phone |
| Oderzo | 042275 | (****) | Phone |
| Oderzo | 042276 | (****) | Phone |
| Oderzo | 042280 | (****) | Phone |
| Oderzo | 042281 | (****) | Phone |
| Oderzo | 042285 | (****) | Phone |
| Oderzo | 042286 | (****) | Phone |
| Olbia | 0789 | **(****) | Phone |
| Olbia | 078901 | (****) | Phone |
| Olbia | 078902 | (****) | Phone |
| Olbia | 078906 | (****) | Phone |
| Olbia | 078907 | (****) | Phone |
| Olbia | 078908 | (****) | Phone |
| Olbia | 078909 | (****) | Phone |
| Olbia | 078918 | *(***) | Phone |
| Olbia | 078919 | *(***) | Phone |
| Olbia | 07892 | *(****) | Phone |
| Olbia | 07893 | *(****) | Phone |
| Olbia | 07894 | *(****) | Phone |
| Olbia | 07895 | *(****) | Phone |
| Olbia | 07896 | *(****) | Phone |
| Oleggio | 0321 | **(****) | Phone |
| Oleggio | 032107 | (****) | Phone |
| Oleggio | 032109 | (****) | Phone |
| Oleggio | 032129 | (****) | Phone |
| Oleggio | 032159 | (****) | Phone |
| Oleggio | 03219 | *(****) | Phone |
| Orbassano | 011 | ***(****) | Phone |
| Orbassano | 011021 | (****) | Phone |
| Orbassano | 011022 | (****) | Phone |
| Orbassano | 011023 | (****) | Phone |
| Orbassano | 011057 | (****) | Phone |
| Orbassano | 011491 | (****) | Phone |
| Orbassano | 011492 | (****) | Phone |
| Orbassano | 011493 | (****) | Phone |
| Orbassano | 011524 | (****) | Phone |
| Orbassano | 011587 | (****) | Phone |
| Orbassano | 011820 | (****) | Phone |
| Orbassano | 011823 | (****) | Phone |
| Orbassano | 011838 | (****) | Phone |
| Orbassano | 011844 | (****) | Phone |
| Orbassano | 011848 | (****) | Phone |
| Orbassano | 01190 | *(****) | Phone |
| Orbetello | 0564 | **(****) | Phone |
| Orbetello | 056402 | (****) | Phone |
| Orbetello | 056405 | (****) | Phone |
| Orbetello | 056472 | (****) | Phone |
| Orbetello | 056473 | (****) | Phone |
| Orbetello | 056477 | (****) | Phone |
| Orbetello | 056478 | (****) | Phone |
| Orbetello | 05648 | *(****) | Phone |
| Oristano | 0783 | **(****) | Phone |
| Oristano | 078303 | (****) | Phone |
| Oristano | 078304 | (****) | Phone |
| Oristano | 078305 | (****) | Phone |
| Oristano | 078306 | (****) | Phone |
| Oristano | 078307 | (****) | Phone |
| Oristano | 078308 | (****) | Phone |
| Oristano | 078309 | (****) | Phone |
| Oristano | 078319 | *(***) | Phone |
| Oristano | 07832 | *(****) | Phone |
| Oristano | 07833 | *(****) | Phone |
| Oristano | 078340 | (****) | Phone |
| Oristano | 078341 | (****) | Phone |
| Oristano | 078342 | (****) | Phone |
| Oristano | 078344 | (****) | Phone |
| Oristano | 078345 | (****) | Phone |
| Oristano | 078346 | (****) | Phone |
| Oristano | 078348 | (****) | Phone |
| Oristano | 078349 | (****) | Phone |
| Oristano | 07835 | *(****) | Phone |
| Oristano | 07836 | *(****) | Phone |
| Oristano | 07837 | *(****) | Phone |
| Ortisei | 0471 | **(****) | Phone |
| Ortisei | 047103 | (****) | Phone |
| Ortisei | 047108 | (****) | Phone |
| Ortisei | 047157 | (****) | Phone |
| Ortisei | 047165 | (****) | Phone |
| Ortisei | 047170 | (****) | Phone |
| Ortisei | 047171 | (****) | Phone |
| Ortisei | 047172 | (****) | Phone |
| Ortisei | 047173 | (****) | Phone |
| Ortisei | 047174 | (****) | Phone |
| Ortisei | 047176 | (****) | Phone |
| Ortisei | 047177 | (****) | Phone |
| Ortisei | 047178 | (****) | Phone |
| Ortisei | 047179 | (****) | Phone |
| Ortisei | 047183 | (****) | Phone |
| Ortisei | 047184 | (****) | Phone |
| Ortisei | 047185 | (****) | Phone |
| Orvieto | 0763 | **(****) | Phone |
| Osimo | 071 | ***(****) | Phone |
| Osimo | 071710 | (****) | Phone |
| Osimo | 071712 | (****) | Phone |
| Osimo | 071713 | (****) | Phone |
| Osimo | 071714 | (****) | Phone |
| Osimo | 071715 | (****) | Phone |
| Osimo | 071716 | (****) | Phone |
| Osimo | 071717 | (****) | Phone |
| Osimo | 071718 | (****) | Phone |
| Osimo | 07172 | *(****) | Phone |
| Osimo | 07173 | *(****) | Phone |
| Osimo | 07178 | *(****) | Phone |
| Osimo | 071904 | (****) | Phone |
| Osimo | 071922 | (****) | Phone |
| Osimo | 071929 | (****) | Phone |
| Osimo | 071933 | (****) | Phone |
| Osimo | 071935 | (****) | Phone |
| Osimo | 071937 | (****) | Phone |
| Osimo | 071938 | (****) | Phone |
| Osimo | 071939 | (****) | Phone |
| Osimo | 07195 | *(****) | Phone |
| Ostiglia | 0386 | **(****) | Phone |
| Ostuni | 0831 | **(****) | Phone |
| Ostuni | 083103 | (****) | Phone |
| Ostuni | 08313 | *(****) | Phone |
| Ovada | 0143 | **(****) | Phone |
| Ovada | 014301 | (****) | Phone |
| Ovada | 014302 | (****) | Phone |
| Ovada | 014340 | (****) | Phone |
| Ovada | 014342 | (****) | Phone |
| Ovada | 014343 | (****) | Phone |
| Ovada | 014344 | (****) | Phone |
| Ovada | 014345 | (****) | Phone |
| Ovada | 01436 | *(****) | Phone |
| Ovada | 01438 | *(****) | Phone |
| Ovada | 01439 | *(****) | Phone |
| Ozieri | 079 | ***(****) | Phone |
| Ozieri | 07956 | *(****) | Phone |
| Ozieri | 07957 | *(****) | Phone |
| Ozieri | 07958 | *(****) | Phone |
| Ozieri | 07959 | *(****) | Phone |
| Ozieri | 07970 | *(****) | Phone |
| Ozieri | 07971 | *(****) | Phone |
| Ozieri | 07972 | *(****) | Phone |
| Ozieri | 07973 | *(****) | Phone |
| Ozieri | 07974 | *(****) | Phone |
| Ozieri | 07975 | *(****) | Phone |
| Ozieri | 079762 | (****) | Phone |
| Ozieri | 079763 | (****) | Phone |
| Ozieri | 079767 | (****) | Phone |
| Ozieri | 079768 | (****) | Phone |
| Ozieri | 07977 | *(****) | Phone |
| Ozieri | 079780 | (****) | Phone |
| Ozieri | 079781 | (****) | Phone |
| Ozieri | 079783 | (****) | Phone |
| Ozieri | 079785 | (****) | Phone |
| Ozieri | 079786 | (****) | Phone |
| Ozieri | 079787 | (****) | Phone |
| Ozieri | 079788 | (****) | Phone |
| Ozieri | 079789 | (****) | Phone |
| Ozieri | 079955 | (****) | Phone |
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