The new iPad and the iPad 2 do not have the same radio capabilities, so perhaps if you searched on the internet for the difference in their communications abilities you would see that it is likely that my answer to the OP is also your answer.
You are highjacking someone else's topic as if it is your own.
I'm not highjacking the thread.
I made my own thread and ton of test. That can help us debug the problem see threads below.
Both ipads have identical umts/hspa/hspa+ and gsm/edge frequencies. Ipad3 just has lte additionally.
See testing i did.
1)How can local sim not work on ipad3 but on ipad2 it works 3g
2)how can att with romaing work on same 3g network where local sim of that network doesnt work
3)how can the a different local provider work on ipad2 but gives no service on ipad3.
I'm even working in telco we install the 3g network here for 1 provider.
Let me post the freq where i get no service with 1 provider.
Telesur 900mhz ul 890.20-902.40 dl 935.20 - 947.40 gsm
1800mhz ul 1710.20 - 1747.40 dl 1842.40 gsm
2100mhz ul 1960-1980 dl 2150-2170 umts
Umts band 850mhz
My problem why does certain things work with ipad2. Even att roaming on ipad 2 has 3g network coverage within 10sec and with ipad3 it takes a minute to get coverage?