Hi ewang, thanks for pointing this out. Each telephony API handles pricing a bit differently. For instance, a production US phone number with Tropo is $3/mo whereas with TelAPI it's only $1/mo. A production toll free number with Tropo is $5/mo whereas with TelAPI it's only $2/mo.

Consumers in this space have a great deal of feature/pricing autonomy. So when it comes to selecting a telephony API that's right for them, they're well-positioned to identify the best feature/pricing balance.

Thanks again for the comment!