Help texting problem, sent msgs are received filled with ? marks

[Braaainz]

I have a texting problem. When I send out text messages, the people receiving them say that between each character is a question mark.

For example, I could send out a text message,

Hey, how's it going today. Are you planning on going to the beach later and enjoy the sun?

They get,

H?e?y?,? ?h?o?w?'?s? ?i?t? ?g?o?i?n?g? ?t?o?d?a?y?.? ?A?r?e? ?y?o??u? ?p?l?a?n?n?i?n?g? ?o?n? ?g?o?i?n?g? ?t?o? ?t?h?e? ?b?e?a?c?h? ?l?a?t?e?r? ?a?n?d? ?e?n?o?y? ?t?h?e? ?s?u?n??

Any idea of what's going on? Is there a limit to the number of characters I can put in a text that I'm going over?