I have tested all of the adapters you are taking about and i have my conclusions that i want to share.
Here are the main problems:
- All adapters are thick and if you are not careful you can easily damage the simcard slot of the phone
- All adapters are working only some time ( if you stay at home for 3 days they will work for 3 days, as they loose signal only when your phone switches the network cell )
- All adapters are not working in 3G/EDGE for more than few hours
They use the same unlocking method that they copied from each other and from other simcard adapters already available on the market so they perform the same. Some adapters like YESSIM they don't even copied the hardware right ( so you have to do some additional hardware modifications to get it working )
The solution for loosing signal after few hours:
Keep at all times an unlocked phone with you
Take out the simcard put it into the unlocked phone
Wait until the phone aquires network
Put back the simcard into iPhone
So i am sure 100% that if you think your iPhone is working ... you'll just have to wait few hours/days to prove yourself you are wrong.