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I got my 9900 and 9360 on ebay, they are att but unlocked. Am in zambia my service provider does not have 4g every where, bt since yu can't choose which band yu would like 2 fall on, it reverts to edge. I wanted to find out if there is a program or a way of adding a 3g band to the phone for selection. Because my service provider supports 3g the whole country. Pliz help thanx in advance.
Can you not go into network connections and see if you can change,
If by 4G you mean LTE, the 9900 is not capable of LTE. But if your carrier, like most other African GSM carriers, has 3G on UMTS band 1 (2100 MHz,) then this phone should be getting you 3G...
And BTW, the reason you can't select which network is AT&T. I just looked at my Telus 9900, I see an option for 3G/H+. AT&T is notorious for locking network selection down. Try updating your OS, to a non-AT&T one preferably, and see if that helps.