Salvafone, because of their minimal requirements, can run on the vast majority of mobile market (85% are potentially compatible, according mobilezoo). However there may be some phones where Salvafone will not work or work with restrictions.

To check whether your phone is compatible with Salvafone, best is to download and test. If it is incompatible, the phone itself or Salvafone so indicate with an appropriate message.
However, the current version of Salvafone (version 2) does not work with certain mobile brands. The following is a partial list of these brands, with the motives and Salvafone version that will solve the problem.
Are compatible virtually all phones with Java technology made since 2006. Specifically, they must meet these minimum requirements:
CLDC 1.0, MIDP2.0, JSR-75, JSR-120
You can view a list of most of them here.