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Unable to connect to 4G with Lenovo Tab4

Hi, I am from Germany and visiting US right now. I bought a AT&T SIM card for my Lenovo Tab4 (Lenovo Tablet TB-8704X). I am traveling in Portland and all of Oregon but I never could connect to 4G. The tablet should be able to connect 4G, cause it is doing with my German T-Mobile SIM. The APN is set

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3G is not working on Note 3 SM-N900A in Pakistan on Ufone, Mobilink etc.

I have got Galaxy Note 3 (SM-N900A), every thing is working fine but 3g is not working on UFONE and other networks because there is no "Network Mode" in Network Options to select WCDMA, kindly guide me how it will work or how to enable WCDMA? Does this cell support WCDMA Band? I have changed by *#22

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