4G SIM cards?

[Roberth5011]

Do 48 mobile supply 4G SIM cards?

[dalyer]

All 48 SIMs are 4G/5G.

• https://community.48.ie/t5/Most-Popular-Questions/All-you-need-to-know-about-SIMs/td-p/15523
• https://community.48.ie/t5/The-Knowledge-Base/12-99-plan-now-includes-5G-at-no-extra-cost/ta-p/61556

What exactly are you looking for? 

If you need to contact 48 support then see the links in my signature below.