iPhone How to switch to different gsm sim after unlock iphone 4S sprint with gevey ultra S

[briandang98]

I have an iphone 4S sprint (CDMA). I successfuly used gevey ultra S (multi network) to unlock it and used in Tmobile (GSM). Now if I want to use different GSM phone carrier like AT&T or oversea GSM phone carrier , do I
need to do something like reset, start from the beginning or just put the
different SIM card (over gevey card) in.
I have tried to put an AT&T SIM card in but the phone shows NO SERVICE.
I don't know it is the AT&T SIM problem (because it is an SIM took from
an AT&T iphone 4 which has been disconnect) or I have to do something.
If anyone have use gevey sim please give me some advice.
Thanks

 

[DerekRod]

Doesnt the ultraS come with a reset sim you have to use if you want to switch sims?

 

[dhlizard]

Have you tried the Applenberry website.
They have support information on the website on how to use their sim interposers.

 

[briandang98]

Doesnt the ultraS come with a reset sim you have to use if you want to switch sims?

Yes, but I don't know when I reset using the white reset SIM what carrier do
I have to select ? Sprint US ( the original phone lock to ) or Tmobile US ( the one it use now )?
I tried to contact Applenberry because the instructions in their website is not
clear about the reset.

 

[DerekRod]

Yes, but I don't know when I reset using the white reset SIM what carrier do
I have to select ? Sprint US ( the original phone lock to ) or Tmobile US ( the one it use now )?
I tried to contact Applenberry because the instructions in their website is not
clear about the reset.

You pick the carrier itslocked too