Abstract: UTe2 is a rare example of a material exhibiting multiple spin-triplet superconducting phases, including reentrant superconductivity at record magnetic fields up to 80 Tesla. Though studied for some time, the exact nature of these phases is still not fully understood and debated. In this talk I will provide an overview of what is known about these phases, mostly through the prism of the theoretical models we developed during our collaboration with the experimentalist group at Cambridge University. I will in particular focus on the developments in our understanding of the so-called SC2 phase that persists up to 35 Tesla, at which point it appears to be destroyed by a metamagnetic phase transition into a polarized paramagnetic state. Among other phenomena, this phase has recently been found by our collaborators to exhibit a memory effect when coexisting with the low-field SC1 phase: the critical current is found to depend on the history of the applied current. Even more recently, it was found to exhibit the superconducting diode effect when briefly coexisting with the polarized paramagnetic state. I will present our current theoretical understanding of these unusual phenomena, and also discuss what (little) we know about the even more mysterious SC3 phase that only exists at even higher fields.