Are you talking about turning up the processor speed? Or a cell phone booster?
Can't help with processor tweak. I can say the cell booster is awesome. I prefer Wilson Electronics. I have three 3G boosters. I have a 4G Wilson Sleek booster on order. The Wilson stuff is dynamic. If it senses good signal it will turn down the power to avoid interference. As your signal goes downhill it will ramp up the power. It can improve your speed if you're not next to the tower. If coverage is marginal the booster can help with battery life because the phone is no longer searching for service.