Seems that for some of these countries (at least the UK), Twilio is still some way ahead, in that Plivo can't do outbound SMS or freephone numbers.
Noticed an interesting price thing with Twilio while comparing, which seems misleading to me... The big numbers on https://www.twilio.com/voice/pricing for the UK state 10c/min for mobiles, but lower down the smaller print shows that this price is only for a few prefixes (44751, 44754, 44759, 447500), and that most mobile numbers (all other 447) are 32c/min.
While you're here, I just created an account, on your login form it says "Username/Email ID" but it only seems to work with username, not email.
Also, I'm sure you've already considered it so probably no point me mentioning it, but would be interested if you could share your reasoning for not offering the free credit like Twilio do. As a single point of data, I signed up for Twilio and started playing around because of that offer (even though it meant putting a little in myself), despite having no use for it at the time. Without it I probably wouldn't have bothered, whereas now I'm someone who, while never had the need to spend more than a few dollars here and there with them, am happy using their service as my go-to whenever I need any voip/sms stuff.
Regarding the first point, can you email us at support@plivo.com, and we will see why it is not working.
Regarding free credits, at this point we made the decision to not offer any at the time of registration. I obviously cannot comment on what others are doing, however happy to connect with you to understand your use case and see how we can get you on boarded.
Everything/everyone doesn't have to be worth based on the $$ you bring us. Your comments sounded interesting and I still feel connecting would be a good idea :)
Noticed an interesting price thing with Twilio while comparing, which seems misleading to me... The big numbers on https://www.twilio.com/voice/pricing for the UK state 10c/min for mobiles, but lower down the smaller print shows that this price is only for a few prefixes (44751, 44754, 44759, 447500), and that most mobile numbers (all other 447) are 32c/min.