problems in internet network

&lt;p&gt;&lt;b&gt;Location/place&lt;/b&gt;: mumbai&lt;/p&gt;<p><b>Name of company/service</b>: tata docomo</p>i bought this new tata docomo simcard
no: 8655815424 in jan 2013 but my internet doesn’t work properly. There is constant problem in network regarding internet and that is very irritating. This didn’t use to happen with my previous docomo sim. Please help.