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Hi
If you have poor/weak network signal you can't expect data connection. Phone should change band from 3G to 2G (Edge) then you should be able get access to data.
If you using third party network provider you need go to settings - more - mobile networks - data roaming - on
If you are fully sure that in your house or in are is weak signal you can buy signal repeater which increase/boost network signal, quality of phone calls, data speed and reduce battery usage.
https://m.aliexpress.com/search.htm?keywords=3g+gsm+repeater#/
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