What should I do about problems with iphone 4?

I have an iphone 4 and I have unlocked firmware 4.3.1 and I am using it on t-mobile but I am facing a weird problem as I do not find my service providers at times which is pretty annoying is there anything which I can use to boost my signal and the connectivity because I want to stay in touch with my family and friends. If someone has any experience with this please tell me also ……a straight forward reply will be appreciated …..thanks in advance

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