SMS or Phone Verify

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Here is a list of providers do phone system & SMS

Twilio (US & Worldwide)
OnVerify (US & Worldwide)
Plivo (Worldwide)

List of providers that only do SMS

Amazon SNS (Worldwide)
BulkSMS (US & Worldwide)
Clickatell (Worldwide)
ClickSend (Worldwide)
Fontech (Brazil)
IletiMerkezi (Turkey)
Medansms
MesseageBird (Worldwide)
Mim SMS (Bangladesh)
MSG91 (India & Worldwide)
Mysubmail (China & International)
Netgsm (Turkish)
OMGMS (China)
SMS Alert (India & Worldwide)
SMSBao (China)
SMS Gateway Center (India & International)
SMS Gateway Me (Worldwide)
SMSAPI (Worldwide)
SSL Wireless (Bangladesh)
Super Solutions (Pakistan & Worldwide)
TurboSMS (Ukrainian)
XeonBD (Bangladeshi)
YourBulkSMS (India)