Safe handling of the phoneROPE is only possible in combination with a stable smartphone case (e.g. hard plastic, aluminium, polycarbonate). We do not recommend the use of soft covers due to their instability (e.g. silicone, gel, rubber).
In general, make sure that your case permanently encloses all four sides of your phone after mounting the phoneROPE, otherwise it could fall out of the case.
Cases with a large camera cut-out are very suitable. We do not recommend cases with a precisely fitting lens cut-out.