1. If the company wants to send messages to people that have opted out (DND) then you are working for the wrong company.
2. To send text messages to someone you need to use their provider's methods. Every one is different. That is the reason for using a service. They only way that your client will be able to send messages will be to have someone write to each providers specs.

>API seems to be easy But have some hurdles .
>
>(1) API will not deliver messages to the numbers who have registered as DND (DO NOT DISTRURB)
>(2) As per the policy of the company for which I am planning to make an application, they do not want to share information to any third party.
>
> So after all thoughts we have finally ruled out the API option.
>
>Regards
>
>
>
>>>I have a cursor with two columns mobileno & Message. I want to send SMS using my GSM Mobile Handset.
>>>
>>>I dont want to use third party product like Ozeki etc. Is there any code and configration by which I could achieve this.
>>>
>>>Kinldy Guide
>>>
>>>Regards
>>
>>I advice you use any sms provider's web service. You can send thousands of sms in a few seconds and follow up sms reports easly. Also their sms prices lower than send by phone. I used this way.