can we have both the device mobile phones as primary and secondary device because of unavailablity of laptop?
In which scenario you are asking this is a concern. But if you in general asking it for your use then yeah you can keep two mobile phones as a primary and secondary device. Now if there is any regulations for the purpose you are asking and its mentioned in the brochure then you need to have a Laptop.
I hope this answer helps. All the very best for your future endeavors!