Fast radio bursts (FRBs) are characterized by short (ms) and bright bursts of radio waves. From their dispersion measure, these events emanate from extragalactic sources. FRBs occurs roughly 1000-10000 per sky per day and thanks to new radio operating facilities (CHIME, ASKAP, MeerKAT…) the detected number increased substantially in the last months. Two populations emerge from these studies, no repeating (associated to a catastrophic event) and repeating sources. Many theoretical models have been proposed to explain the radio emission but the nature of FRBs remains today still elusive. Multi-wavelength observations might help to constrain the radiation mechanism even if their unpredictable activity seriously complicates the organization of such campaigns. The situation is more favorable for repeating sources and we are conducting a research project on FRB121102, the first repeating FRB discovered. Our effort made firstly used of the INTEGRAL satellite, the Nançay Radio Telescope (NRT) and the Effelsberg antenna with the aim at looking for high energy emission during an active state of the source. In this talk, I will describe our past and actual campaigns on FRB121102 and address some prospects on this new and exciting class of objects of the transient sky.