What percentage of the list typically results in delivery failures (e.g., SMS bounce backs, call disconnected tones)?

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The percentage of a list that results in delivery failures (e.g., SMS bounce backs, call disconnected tones) can vary significantly based on several crucial factors. It's impossible to give a single definitive number without knowing the specifics of the list and the communication method used. However, we can discuss typical ranges and the elements that influence these failure rates.

SMS Delivery Failure Rates
Generally, SMS has a relatively high delivery rate compared to other digital communication channels like email. However, failures do occur. Here's what to consider:

List Quality: The most significant factor is the quality and chinese overseas australia phone number list hygiene of the phone number list.
Invalid or Non-existent Numbers: If the list contains typos, disconnected numbers, or numbers that were never valid, the bounce rate will be high.
Outdated Numbers: People change phone numbers, so older lists are more likely to have delivery failures.
Landline Numbers: Sending SMS to landline numbers will result in delivery failures as they cannot receive text messages.
Opt-Outs and Blocked Numbers: Numbers that have opted out of receiving SMS or have blocked the sender will also result in failures.
Message Content: Carriers may filter messages containing spam-like content, potentially leading to delivery failures.
Carrier Issues: Temporary network issues or carrier-specific filtering can sometimes cause delivery problems.
Recipient Device Issues: A recipient's phone being turned off, having a full inbox, or being out of network coverage can lead to temporary delivery failures (soft bounces).
International Numbers: Sending SMS internationally requires correct formatting, and delivery can be affected by the recipient's carrier and country-specific regulations.
Typical Ranges:

Well-maintained, opt-in lists: With regular cleaning and validation, bounce rates can be as low as 1-5%. Some sources suggest excellent delivery rates are above 90%.
Purchased or older lists: These can experience significantly higher failure rates, potentially ranging from 10-25% or even higher, depending on the list's age and source.
Lists with a high proportion of invalid or outdated numbers: In such cases, failure rates can exceed 30%.
Call Disconnected Tones
The equivalent of a "bounce back" for voice calls is a disconnected tone or a failure to connect. The "failure rate" for calls can be influenced by:

Number Validity: Similar to SMS, calling disconnected or invalid numbers will result in a disconnected tone.
Recipient Availability: If the recipient's phone is off, they are in an area with no reception, or they don't answer, the call won't connect. This isn't a "failure" in the same technical sense as a bounce back but results in an unsuccessful communication attempt.
Network Congestion: While less common now than in the past, network congestion can sometimes lead to calls not connecting or being dropped.
Blocked Numbers: If the recipient has blocked the caller's number, the call will likely not go through.
Technical Issues: Problems with the caller's or recipient's phone or the telecommunication network can cause dropped calls.
Typical Ranges:

Disconnected/Invalid Numbers: The percentage will directly correlate with the quality of the phone number list, similar to SMS.
No Answer/Busy: This is highly variable depending on the time of day, the recipient's availability, and the purpose of the call. It's not a technical failure of the list itself.
True "Dropped Calls" (technical reasons after connection): In modern, well-maintained networks, the dropped call rate is typically very low, often less than 1% and significantly less than 0.01% in landline networks. Mobile networks might see slightly higher rates (0.1% to a few percent).
In conclusion, for both SMS and voice calls, the quality of the phone number list is the most critical factor determining the rate of delivery failures or disconnected calls. Maintaining a clean, up-to-date, and ideally opt-in list is essential to minimize these issues and ensure efficient communication.