SleekFlow charges for SMS, MMS, and Voice usage based on the channels you use. Depending on your setup, your total charges may include:

• SMS or MMS messaging usage
• Incoming and outgoing voice call usage
• Monthly phone number fees
• Mobile carrier or network surcharges
• Optional Voice features, where applicable

Usage charges are deducted from your SleekFlow wallet. Rates vary by country, message or call direction, number type, destination, and mobile carrier.

SMS and MMS billing units

SMS and MMS are billed differently. SMS is measured in segments, while MMS is measured as full messages.

• SMS (per segment):
  • SMS is broken into segments depending on length:
    • 1 segment = up to 160 characters (GSM standard)
    • or up to 70 characters if emojis or non-Latin text are used
    • Longer messages are split into multiple segments, and each segment is billed separately

Example:

• A 300-character SMS in English = 2 segments (billed twice)
• A 300-character SMS with emojis is split into more segments, since each segment is capped at 70 characters

• MMS (per message):
  • MMS is billed as one unit per message, regardless of text length or media included. Unlike SMS, MMS is not split into segments.

Factors that affect pricing

The cost of a message is also influenced by its direction and whether it is delivered successfully.

• Message direction:
  • Outbound messages: You pay for every message you send (SMS segments or MMS messages).
  • Inbound messages: Messages received from customers are also billed. Inbound rates are usually lower but apply to both SMS and MMS.
• Delivery status:
  • Delivered messages: Charged normally once handed off to the carrier.
  • Failed messages: If a message fails to deliver (e.g. invalid number, unreachable device), a failed message processing fee may apply. This fee is typically lower than the standard message rate and depends on the carrier.
    • ℹ️ Processing fees only apply when the carrier has already attempted delivery and returned an error status.

Carrier fees

In addition to SleekFlow’s standard SMS and MMS rates, some mobile carriers add their own surcharges. These are billed per message or per segment, depending on whether the message is SMS or MMS.

• When they apply: Carrier fees can be charged on both outbound and inbound messages.
• Why they vary: The fee depends on the destination country, the recipient’s mobile carrier, and their policies.
• How they appear: Carrier fees are listed separately from SleekFlow’s message costs in your invoice.
• Calculation basis: The fee is determined by the recipient’s carrier, not the sender.
   

SMS and MMS pricing

The following tables show SleekFlow's SMS and MMS messaging rates by country. Carrier surcharges (above) may be added on top of these rates.

United States

Local numbers

Toll-free numbers

Brazil

Hong Kong

Malaysia

Singapore

United Arab Emirates

United Kingdom

Voice call pricing 

How Voice billing works

• Call direction: Voice pricing depends on whether the call is incoming or outgoing.
  • Incoming calls: The rate usually depends on the type of phone number receiving the call, such as local, mobile, national, or toll-free.
  • Outgoing calls: The rate usually depends on the country and type of number being called, such as landline, mobile, toll-free, or a specific geographic region.

Voice rates are listed per minute, but calls may be billed using a minimum duration and fixed increments after that. For example:

• 10 + 10 seconds: The first 10 seconds are charged, followed by additional 10-second increments.
• 30 + 10 seconds: The first 30 seconds are charged, followed by additional 10-second increments.
• 60 + 10 seconds: The first 60 seconds are charged, followed by additional 10-second increments.
   

Brazil

How calls are billed: A minimum of 30 seconds, followed by 10-second increments.

Hong Kong

How calls are billed: A minimum of 10 seconds, followed by 10-second increments.

Indonesia

How calls are billed: A minimum of 60 seconds, followed by 10-second increments.

Malaysia

How calls are billed: A minimum of 10 seconds, followed by 10-second increments.

Singapore

How calls are billed: A minimum of 60 seconds, followed by 10-second increments.

United Arab Emirates

How calls are billed: A minimum of 10 seconds, followed by 10-second increments.

United States

How calls are billed: A minimum of 10 seconds, followed by 10-second increments.

Phone number fees

An active SMS or Voice phone number has a recurring monthly fee, in addition to messaging and call usage.

• The fee is charged for each active phone number you keep.
• The amount depends on the country and number type.
• It appears as a recurring charge on your invoice, separate from messaging and call usage.
• A phone number continues to incur its monthly fee even if no messages or calls are made.

Monthly phone number pricing

Additional Voice charges

Some Voice features may generate additional usage charges beyond the per-minute call rate, including:

• Call recording
• Recording storage
• Call transcription
• Voice SDK connectivity

The exact charges appear in the SMS and Voice wallet usage summary.

Important notes

• Rates are shown in USD.
• Available number types and capabilities vary by country.
• Some countries support SMS but not Voice, or Voice but not SMS.
• Carrier and network fees may be added to the listed base rate.
• Pricing may change when carrier or network costs change.
• Taxes and regulatory charges may apply separately.