Since you are targeting people with development questions, if I were doing this my route would be to go to stackoverflow, Android stack, etc and start building up a reputation for knowing what you're talking about. Don't push your services onto people, everyone hates that, just link to your company in your profile and let people look themselves.
This route solves two problems: 1) It targets people struggling in the specific domains you want to offer your services and 2) It proves to your potential customers that you have expertise in that domain.
The problem in your field is there are literally thousands of small groups in Pakistan and India offering development services. I've tried very many and it's always the same, they claim to be experts and after 5 minutes talking to them, they clearly have no clue about the subject. The stack overflow route would go a long way to allay this very common concern for companies looking to out-source. But you will need to spend several months of producing skilled answers, not just spamming answers for reputation.