The Telstra Group Ltd (ASX: TLS) share price has risen more than 26% in the last four months, as the chart below shows. It's possible the ASX telco share may still be undervalued. At a time when there ...

The Telstra Group Ltd (ASX: TLS) share price once traded at more than $6 apiece, as the chart below shows. But you'll notice that we have to go back to 2015 to see that level — nearly a decade ago!