Possible scam?

[FLASHY4830]

I had a call yesterday claiming to be from Sky, saying I will receive a new 5G SIM card at no extra cost to help improve reception. The call handler's English was so poor he couldn't understand my email address so I hung up.

Today I have had numerous calls again claiming to be from sky offering me a 40% discount  on my bill and all I need to do is give them my email address. 
Are these scams? 

[daveNOS]

@FLASHY4830 Yes everyone of those calls was an attempt to scam you.

[Stewy88]

Definitely a scam I've had same call offering 40% discount all from Asian voices using a vpn so it looks like they are calling from uk I just don't answer the phone if I don't recognise the number 

[twilight+princess]

100% scam. The current ones are either that they can offer a discount - usually 40% - or that your sim will stop working when 3G is turned off so you'll need a new sim.