c# - Send a cellphone SMS text without the use of a third-party service -

is possible using windows server, .net, c# or php send sms text message q customer's cell phone without depending upon third-party service (excluding api provided phone company).

my require use sms text messaging automate authentication when resetting customer's password, , have security issues i'd rather not use third-party. more can keep internal our project better (unless can justify security in answer).

update:

we've decided use sms relay app , easy implement. there many apps this. here 1 i'm going try.

https://play.google.com/store/apps/details?id=eu.apksoft.android.smsgateway&hl=en

you can build simple mobile app can query api , send messages directly phone running on. simple, cheap , you're in control!

we have solution in project im working on atm , seems work great. http request , using sms/send message. @ least on android can done handful of lines of code :)