If I order replacement SIM will current SIM stop working?

[dineen1]

If I order a replacement sim with the same number will my current sim stop working.

[dalyer]

If you choose the "block" option then yes. 

Otherwise, no. 

See here: 

• https://community.48.ie/t5/The-Knowledge-Base/Do-You-Need-a-New-SIM/ta-p/8487

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