Lenovo a6000plus network problem?

I bought and I have aircel 3g sim(a.p).in my old phone it running very fast but in a6000 plus it running very slowly please fix it. I already using 3g in my phone thought

Carl

First insert the sim in the the Sim slot 1 as only sim slot 1 supports 2g/3g/4g and sim slot 2 supports only 2g, if problem persists try contacting the lenovo helpline or contact flipkart if your 30 day guarentee has not expired.

Hope it helps
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Shubhang