Some customers of us told us that the iRose method for patching their phones to use 3G cards with AIO is not working anymore.
We have decided to upload a patch that can be used for this purpose in our Cydia Repo frankerebus mirror.
Cydia Repo URL: http://aio-sim.com/settings/patches
Install this Repo using Cydia and select the iOS 7 5 5S 5C Patch from the list and you will have full signal.
Of course only 2G data (EDGE/GPRS) will work.
P.S. You can also use the CommCenterPatch from the Repo if you need to patch your phone with Custom Carrier Bundles.