The estimated average salary for a Customer Service Representative (CSR) at O2 is £23,625 per year or £11 per hour, but some professionals have reported earning up to roughly £39,818 per year (90th percentile). The typical pay range is between £19,264 (25th percentile) and £30,131 (75th percentile) annually. This is based on 31 salaries submitted by O2 Customer Service Representative (CSR) professionals on Glassdoor, as of Jul 2026.