(Some of these have free trials needs to be cleaned of ones that provide free trials with ability to receive sms. Twilio does work but it is not always good for google.) Sign up using temp email to make a trial account on the ones that offer free trials. Also a last resort option to using your own phone number if you choose to purchase a temp number.
Available SMS Gateways
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1. Twilio
2. Clickatel
3. Text Local
4. Asterisk
5. MSG91
6. Plivo
7. SMS Global
8. Bulk SMS
9. Nexmo
10. Route SMS
11. SMSKaufen
12. Kapow
13. Zang
14. InfoBip
15. RNNH
16. SMSIndiaHub
17. ShreeWeb
18. SMSGateway.me
19. Top10SMS
20. Elibom
21. Hablame
22. Wavecell
23. SIPTraffic
24. SMSMKT
25. MLat
26. NRSGateway
27. Orange.com
28. Globexcamsms.com
29. Camoo.cm
30. Kannel.org
31. Semysms.net
32. Smsvitrini.com
33. Semaphore.co
34. iTexMo.com
35. Chikka.com
36. 1S2U.com
37. Kaudal
38. cm.com
39. sendoutapp.com
40. viralthrob.com
41. masterksnetworks.com
42. messagebird.com
43. mx.fortdigital.net
44. smspro.mtn.ci
45. cnid.com.py
46. digitalreachapi.dialog.lk
47. voicetrading.com
48. aws.amazon.com/sns
49. nusasms.com
50. sms4brands.com
51. cheapglobalsms.com
52. www.experttexting.com
53. www.lightsms.com
54. Adicis
55. http://smsc.smsconnexion.com/
56. http://www.brandedsms.net
57. http://www.txtnation.com/
58. https://www.telesign.com/
59. http://ezeee.pk/
60. https://www.moreify.com/
61. https://www.dialog.lk/
62. https://www.tropo.com/
63. http://www.cheapsms.com/
64. CCSSMS
65. http://www.my-cool-sms.com/
66. https://smsbump.com/
67. https://bsg.world/
68. https://www.smsbroadcast.com.au/
69. http://bullsms.com/
70. http://www.skebby.com/
71. Infobip SMPP
72. SMSGlobal SMPP
73. Clickatell SMPP
74. JasminSms SMPP
75. JasminSms HTTP
76. Wavecell SMPP
77. Ibrbd