You have to contact Customer Service to see what can be done. They make exceptions all the time. If you are told not to have a phone during the investigation than no you cant. They may hand over a loaner , but they may not.
TBH, i bet its safe to say they will not. As its not in anyway shape or form their fault(ie fault hardware ) So by law they are not required to give you one.
Best of luck. If you really need one, you may want to go buy a cheap throw away phone during the time your phone is with police.