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About four SMS segments for the plain version, assuming 160 characters per segment. With an emoji on every line it becomes roughly twelve, because emoji force the whole message into UCS-2 encoding at 70 characters per segment.

SMS uses GSM-7 encoding for basic Latin characters, which fits 160 characters per segment. Any character outside that set — including every emoji — switches the entire message to UCS-2, where only 70 characters fit per segment.

Usually, if it is four segments. Most phones reassemble multi-part SMS correctly. Above ten segments the failure rate rises noticeably, and parts can arrive out of order.

It works for 50 lines and it works for 100 without emoji. Above that, or if you want emoji, use WhatsApp, iMessage or RCS — all of which handle long messages without splitting them.

No. Digits and full stops are all in the GSM-7 set, so a numbered list stays in the efficient encoding. It adds characters, but it does not change how they are stored.