Improve Sony cellular phone weak antenna

**** This job is not related to smartphones or Android **** I want to use Sony T700 cellular phone with 3G. However, the signal reception that it can provide is very weak. Where other phones have 1 or 2 antenna sticks and work fine, this one has 0 and wouldn't connect to the network at all. Only where the signal is strong it picks it up and have 1 or 2 sticks. The job is to do some firmware tweaks so that signal reception improves. If you haven't done something similar successfully before, please don't bid.