Within the UK, some student parachutists will be on radio, yes. Useless in freefall, they are used as a 'talk down' aid once a student is under canopy. The number of jumps a student will do with a radio depends on a few things, including the syllabus being followed (AFF [Accelerated Free Fall] versus RAPS [Ram-Air Progression Systems]), the student's level of competence, dropzone SOPs and so on. Often, radios are only carried on the first few jumps and not for the entirety of training, similar in many respects to trainee pilots, who might undertake a 'first solo' long before they qualify fully.