3G issue on Blu cell phones

Papi_papi

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Joined
Oct 4, 2015
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Current Phone Model
Blu Studio 6.0 HD Andr. 5.0.2
good day, i have 3 Blu phone, a Studio 6.0 HD, Studio 5.5s and Studio 5.5. The problem i have is that all 3 don't connect to the 3G network. I know is not the the Network because i try the same chip on another brand phone and the 3G worked. i need help for a solution. if it is software or setting. The 6.0 HD use Lollipop version 5.0.2. thank you in advance for your assistant
 
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