16-03-2015 03:39 PM
16-03-2015 04:31 PM
Why do you need to use the old SIM when the new one works?
Is it because the two SIMs are different sizes/form factors (e.g. micro versus nano) or something?
If you really need to switch back to the old SIM then you'll need to ask 48 support to sort this out for you:
http://www.48months.ie/help#ask-a-48-agent
Hope this helps.