Send SMS is where messages leave the platform. It has two modes: Single SMS for one recipient, and Bulk Campaign for many.
Send SMS has no entry in the left sidebar. You reach it from the Send SMS button in the header, or from the button on SMS Management. If you have been hunting for it in the navigation, that is why.

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Before your first send

Three things need to be in place. All three are one-off.
1

Have credits on your account

Accounts start empty and cannot send until topped up. Check the credit figure in the header. If it reads zero, or is missing entirely, see Billing and usage.
2

Have an approved sender ID

Every account is given one called HEULLO, already approved, so you can send immediately. To send under your own name, request one on Sender IDs and wait for approval.
3

Know the recipient in international format

+35799123456. With the country code, no leading zero.

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Send a single message

1

Open Send SMS and choose Single SMS

Click Send SMS in the header, then the Single SMS card.
2

Enter the recipient

International format, for example +35799123456.The validation message appears when you click away from the field, not while typing, so the field remains unmarked while you are entering the number.
3

Pick a sender ID

Your default is already selected. Only approved sender IDs appear in the list.
4

Write your message

Watch SMS parts on the right rather than the character count. That number is what you are billed for. See what you are charged for below.
5

Optionally schedule it

Leave the schedule empty to send now. Set a date and time to send later, up to a year ahead.
6

Send

The button reads Send for an immediate message and Schedule if you set a time. The form clears and you are taken to SMS Management.
Your message appears in SMS Management with a status. Sent means the network accepted it.

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Send a bulk campaign

Bulk runs as three stages: Recipients, Message, then Schedule and send.
1

Name the campaign

Required before you can continue. Use something you will recognise later in SMS Management and Reports, because this is how the campaign is listed.
2

Choose where the recipients come from

Three options, covered in detail below. If you are sending to the same group regularly, use a contact list.
3

Write the message, with variables if you want them

Insert variables using the chips above the message box. A CSV column called firstname gives you {firstname}.The phone preview beside the box shows sample values, not real data from your file, so it shows the shape rather than an actual first row.
4

Review the summary

Check the recipient count, the sender ID and, most importantly, credits required. That figure is the part count multiplied by the number of recipients.
This is the moment to catch an expensive mistake. A message that runs to two parts across 5,000 recipients costs twice what a one-part message would.
5

Schedule and send

Send now or set a time. The campaign appears in SMS Management and reports its progress live as it runs.

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Choosing recipients

Pick one of your saved lists. Best for groups you send to more than once, because the list stays maintained in one place. See Contact lists.

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What you are charged for

You are billed per message part, not per message. A short message is one part. A longer one is split and costs a multiple. How many characters fit in a part depends on the alphabet you use.

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How many characters fit

Keeping a marketing message under 160 Latin characters halves its cost against a 161-character version. The single highest-value edit you can make to a large campaign is trimming it back under the limit.

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Two behaviours to account for

The platform converts Greek into the alphabet phone networks use for it, and that conversion folds everything to capitals. Some Greek letters are also mapped onto the Latin letters that look identical.Your recipient sees uppercase text. There is no setting to prevent this, so write Greek messages knowing they will land in capitals.
Each emoji counts as two characters, so a few of them push a message into a second part sooner than the counter suggests. Check the part count after adding them.
Nothing stops you sending a long message. Past 160 characters the field turns red, but the send button still works and the message goes as multiple parts. The red field is a warning, not a block.

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If you do not have enough credits

The Send button is replaced by Add credits, with the exact shortfall shown beside it. Top up and the send button returns.

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Troubleshooting

Check for a validation error on the recipient field. It only appears after you click away from the field, so it can be sitting there unnoticed.On a bulk campaign, check you have named it — step one will not complete without a name.
Compare the part count against what you assumed. Non-Latin alphabets fit 140 characters per part rather than 160, and emoji count double. The transaction in Billing and usage records the exact part count that was charged.
Expected. Credits are taken before the message reaches the network, and returned if the network rejects it. See the step-by-step section below.
If you sent Greek, it will have arrived in uppercase. If you used personalisation variables, check the column names in your CSV match the variables in the message exactly — an unmatched variable is not substituted.
Expand the campaign in SMS Management to see per-recipient status. Numbers pasted through manual entry are not validated before sending, so malformed numbers fail individually while the rest succeed.

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Step by step, in detail

Not needed to send a message. This is here for when you are reconciling a charge or want to know exactly what happens. Two things worth taking from it: credits leave your balance before the message reaches the network, and if the network rejects it they are returned afterwards.