gud info + ela stuff abt SIMz are here in dis thread
Macho dnt use da dual sim card
Coz Ive experienced a burnt Mobitel SIM as a result of using a dual SIM card for 6 months

but its da easiest and da cheapest way to use 2 SIMs rather dan buying a phone
tdevinda - ur wrng abt da codes
That code is to activate/switch between da call quality level in Nokia phones.. dnt use dat feature unneccessarily.. just switch off and on to restart..
By da way if u wanna know info on dual sim card its like dis..
- Varies from model to model
- Ur back cover of da housing sometimes will need some replace or u'll have to scratch its edges in order to have som 2mm room for da dual sim card..
- Price range from Rs. 150/- to Rs. 500/-.. Thrs a gud quality 1 at abt Rs. 850/-
- Switch on and off to switch between da SIMs (Networks)
- May sometimes be bulky.. coz sometimes it will not change da networks or will display Insert SIM at once .. bla bla..
- As an experienced user of 6+months of a dual sim card holder, I will not reccomend it to any 1

Ive got no ideas abt da super sim card.. but thr r shops/ppl who does dat service.. but thrs one problem.. The network ppl have ur SIM card # (The number printed+edged back of da SIM-not da phone number) So it will not tally with ur SIM.. and by anycase whn u need help something with da SIM they (the ppl at da service center of ur network's) will not accept.....