There is no measurable way of telling which is faster - it would likely depend on the speed of your internet connection.
Generally (but not always) the speed of the internet connection to a computer is faster than the speed of the internet connection to a phone.
As the service is hosted by the popfax servers, most of the documents that are sent and received will be turned into "fax data" at the server end, making it so that documents sent to the server are a relatively small load on the amount of bandwidth used.
There also may be a speed advantage to the computer as it is generally quicker to type information into a computer than a mobile phone, however if the user is away from the computer, a mobile phone would often be much faster than having to walk or drive to a nearby computer.
Popfax and Myfax are both reputable companies providing online fax services for personal and professional use. Efax and Nextiva are two other options.
There are various companies that offer pay day loans with no faxing service. Some of the companies that offer payday loans with no faxing service include Speedy Cash and CashNetUSA.
Any voip service isn't reliable to use with faxing. I suggest get an online fax service for your faxing needs. If you are not a heavy fax user then a pay as you go fax to email service like Onesuite Fax plus is perfect for you.
Currently Google Voice does not do fax. What Google Voice does is SMS text (no images), voicemail, and call forwarding/routing. In the future they may roll out a service for fax, but as of now, no.
There are a variety of providers that offer bulk faxing at a fixed price. The main providers are the MTN Service Provider, Telkon Business, BlastFax Faxing Services, Neotel and InterFax.
Blast faxing allows the user to quickly fax documents to a lot of people at once. Blast faxing works though the internet. JBlast is a free online service that allows people to blast fax.
Gotfreefax.com offers a free online faxing service. Another similar website is faxzero.com. Also myfax.com/free advertises this feature. savedelete.com reviews and rates different free faxing websites.
Portable fax is an internet faxing trend. If you have smart phone that has internet connection then its like bringing your fax machine with you wherever you go. Try mobile Extremefax online faxing.
This is a faxing technique where in you use an internet connected PC instead of the traditional fax machine. So no need for a telephone line. I guess you need to subscribe for the service.
There are many reliable online faxing services, but one of the best priced services is called Efax. You should visit their website, www.efax.com, and consider signing up.
Ask your telephone provider or internet faxing service provider.
Internet fax is a paid service. You can choose a plan which would fit to your monthly faxing needs. You can read reviews and compare the plans and pricing offered by different providers.