Weak reception of cellular networks inside buildings might create frustration and make the idea of installing and using of a repeater seem reasonable. While such devices might amplify the received signals they might cause serious interferences as well. Before purchasing, installing or using such a device several requirements have to be fulfilled. Individuals may not proceed to installing and operating repeaters at their own initiative.
The repeater consists a radioequipment product, therefore should abide by the Presidential Decree PD 98/2017 or the Radioequipment Directive of EU (2014/53/ΕU).
This requirement assures that during foreseeable conditions operation ensures essential requirements (safety, protection of health, not creating harmful interferences and effectively uses of radio spectrum). For example, repeaters will not radiate energy outside frequency ranges of cellular networks. Technical specifications and Standards do exist that define the maximum amplification and pause significant challenges especially for broadband repeaters.
If one imports a repeater from outside EU, one is responsible for its conformity. Importing or distributing of non-conformant products might be prosecuted. More information can be found here:
Using a Repeater of Cellular Network
The mobile radio network operators have a license to use the mobile radio frequencies. They plan their mobile radio network and may in the process also take mobile repeaters into account in their planning. Depending on the mobile radio network operator's requirement, a broadband amplifier or a selective amplifier may be used. You are not allowed to operate the mobile repeater without their agreement.
In case one wishes to extend network coverage inside buildings with poor reception, one has to contact the mobile operator of interest for possible solutions. The solution should abide by local, national and European regulations and having the consent of the operator. Contacting and providing consent should be performed by all operators, whose frequencies are being amplified. Network operators plan their network and repeaters alter the frequency reuse plan. Network operators may take into consideration the existence of repeaters in their planning. Depending on the requirements of each operator a specific selective or broadband repeater may be allowed. Operating a repeater without the consent of an operator is not allowed. Frequency planning of a network changes, therefore repeaters, that did not cause interference in the past, might raise issues with interference.
Installation according to technical rules
Repeaters must be installed professionally. For example, if the antennas of repeaters are installed too close to each other or if excessively high amplification is set, the mobile repeater may oscillate (overdriving it causes it to function in the non-linear region and generate its own spurious emissions, which may interfere with the mobile network). In recent years interference reports across Europe have been attributable to mobile radio repeaters. Overcoming radio interference is time-consuming and may have financial consequences for the person responsible.