What's the best way to track brand perception shifts in the telecom space?

For telecom rebrands, I'd run a brand tracker with pre/post waves — Net Sentiment and unaided brand recall are your clearest signals. Pair that with a quick Brand Perception Index survey (around 300-400 respondents per wave) using semantic differential scales on attributes like 'modern,' 'trustworthy,' 'value for money.' YouGov BrandIndex is also solid if you need ongoing passive tracking without running fresh surveys every time.