Can you call Interrail if there is a problem?
+11No it is not possible, but for problem go to the train company staff or desk where you have problems. Like in the Netherlands NS, or in Germany DB.
Or contact the Interrail costumer service via this link.
For probs with TRAINs-its the company that runs the trains there where you are. Do NOT expect too much sympathy in general, railways are not for making customer happy, but to fulfill all burocratic rulings. And you are supposed to be able to help yourself on all the common 1st time probs-there wont be a single one that has not yet been encountered.
For probs with APP: do NOT use your fancy I-fone-too many troubles reported on that thing (haha), contact centre-and DO mention date when travel-as they due to few staff try to respond to most urgent probs first.
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.