Loads of online tools let you test your internet speed.
But arguably the most popular is Speedtest.net by Ookla (a US data firm), which you can find here.
You can also download the app here:
It tests your speeds in a number of ways using local servers, giving you a fairly accurate representation of your real-world download speeds.
Vodafone customers have flocked to social media after experiencing issues when trying to connect calls.
One customer wrote: "Hi @VodafoneUK are your services down? I can't make any work calls. Keeps giving me the 'busy' tone for every number I try."
A second said: "Anyone having problems with @VodafoneUK it’s a nightmare."
This heat map shows where user-submitted problem reports are concentrated over the past 24 hours.
It is common for some problems to be reported throughout the day.
Downdetector only reports an incident when the number of problem reports is significantly higher than the typical volume for that time of day.
