The answer is False.
2G and 2.5G CDMA operators cannot selectively introduce 3G capabilities at each cell without changing entire base stations and reallocating spectrums. This is because 3G is a different technology than 2G and 2.5G, and it requires different hardware and software. In order to provide 3G service, operators must upgrade their base stations and install new equipment. They must also reallocate spectrum to 3G, which means that they will no longer be able to use that spectrum for 2G or 2.5G service.
There are a few ways that operators can upgrade their base stations to support 3G. One way is to install a new 3G radio on the existing base station. This is the most common way to upgrade base stations, and it is relatively inexpensive. However, it does require that the operator have access to 3G spectrum.
Another way to upgrade base stations is to replace the entire base station with a new 3G base station. This is more expensive than installing a new radio, but it does not require that the operator have access to 3G spectrum.
Once the base stations have been upgraded, the operator must also install new software on the base stations. This software will enable the base stations to communicate with 3G devices.
Finally, the operator must reallocate spectrum to 3G. This means that they will no longer be able to use that spectrum for 2G or 2.5G service.
The process of upgrading base stations and reallocating spectrum can be a complex and time-consuming process. It can take several months or even years for an operator to complete the process.
In conclusion, 2G and 2.5G CDMA operators cannot selectively introduce 3G capabilities at each cell without changing entire base stations and reallocating spectrums. This is because 3G is a different technology than 2G and 2.5G, and it requires different hardware and software. In order to provide 3G service, operators must upgrade their base stations and install new equipment. They must also reallocate spectrum to 3G, which means that they will no longer be able to use that spectrum for 2G or 2.5G service.