To find out whether a new version of your message performs better, you first need to know how it has performed in the past. Establish a baseline to compare the results of your new message to. Be sure to note any relevant results like amount of recipients, time of day, day of week, time of month (e.g. did you send the message around pay-day or just before, when everyone postpones spending money until their pay check arrives?), open rate, click-through-rate (CTR), amount of conversions (note: specify what a conversion is for you), conversion rate, and anything else of importance.  
ON-NET routing is the most popular form of messaging globally. It’s the most reliable and preferable way for telecommunications / carriers to receive messages, as the messages from the bulk SMS provider is sent to them directly. For senders that need consistency and reliability, seeking a provider that uses ON-NET routing should be the preferred option.

Texting is the only mobile marketing medium that can reach both smartphone and regular mobile phone users. And, while the Internet is expanding globally, satellite telephone connections seem to be more universal and more reliable than Internet connections. Therefore, text messaging has the widest reach globally compared to any other mobile marketing channel.
Non-Latin based languages, like Chinese, and also emojis use a different encoding process called Unicode or Unicode Transformation Format (UTF-8). It is meant to encompass all characters for efficiency but has a caveat. Each unicode character is 16 bits in size, which takes more information to send, therefore limiting SMS messages to 70 characters. Messages that are larger than 70 characters are also concatenated. These messages can fit 67 characters, and can be concatenated up to 4 times for a maximum of 268 characters.
In the article cited at the beginning of this post, the author boldly claims that “a major chunk of the population is already registered with the DND.” First, there is no clear statistical research backing up this assumption. Second, in the U.S., the Do Not Call registry protects consumers from just that — unwanted calls. It’s designed to prevent telemarketers from harassing consumers. This has absolutely nothing to do with text messaging. Now, if for some reason you do find yourself receiving unwanted text messages, you can file a complaint. But, knowing the permission-based nature of this marketing method, you may never confront this issue.
Dunkin Donuts revived some of their failing stores with an SMS campaign that they advertised through online ads and radio. The campaign rewarded customers for sharing the text offers with their friends. By encouraging sharing and word-of-mouth in their promotion, they leveraged their spending on their SMS campaign and managed to provide sufficient incentive that 17% of those who received texts forwarded them and 7,500 people opted in to their loyalty program. The result was a 21% increase in store traffic. Impressive results.

That depends on your leads, your message and what your primary business is that you're selling. We have seen a 70% better response using RVM because the prospect can listen to your message at their leisure and even save that message and listen to it at a later time when their ready to act on your message by going to your website/capture page, calling your 800Link sizzle call or simply emailing you back for more information.
You will have a greater chance of gaining access to their mobile number by following these guidelines. You can collect their numbers using a sign-up sheet at your register, asking them when talking on the phone, allowing them to submit a form on your website, or by giving them a number that they can text to subscribe to your SMS messages. Whatever you do, keep a copy of their permission to market to them via SMS, if you run into problems you will be glad you did.