Send an SMS through the user's own textbee account and Android phone. Recipients must be in international E.164 format such as +15550100123. The sending phone is chosen automatically: the account default device, otherwise the enabled device with the most recent heartbeat. Only pass device_id when the user explicitly names a phone; ids come from list_devices. Sending costs the user a real message against their textbee plan quota, so do not send speculatively and do not retry a send that may already have gone out. When the account has SMS queueing enabled the result includes an sms_batch_id; pass it to get_messages as sms_batch_id to check per-recipient delivery status.

Read the SMS messages on the user's textbee account, covering every device, no device id needed. direction defaults to "received": checking for a reply or a one-time code is the usual case. Pass direction "sent" to review what went out (each row carries its delivery status), or "all" for a conversation in order. Pass the sms_batch_id from a send to see that send's per-recipient delivery status. To poll for new messages without missing or repeating any: use order "asc" with a from bound, then keep calling with the next_cursor each result prints. from is inclusive and to is exclusive, so consecutive windows tile exactly. Reading does not consume the plan send quota. Messages reach textbee within a few seconds of arriving on the phone, so when waiting for a code, wait briefly and call again rather than tight-polling.

List the Android phones registered to this textbee account: id, name, enabled state, which one is the default sender, when each last checked in, and message counts. Call this when a send fails with a device error, when the user asks which phone will be used, or when you need a device_id. Takes no arguments and sends no SMS.