Answer:
There is something about my cellphone A
I can’t wait to have it in my hand B
Teachers, parents do not understand B
If I have it, I’m never alone A
There is something about my cellphone A
I find it to be just grand B
It obeys my every command B
Shows me the world, everything to be known A
Explanation:
A rhyme scheme is determined by the final sound of the last word in each line of a poem. The very first final sound to appear is always attributed the letter A. Every time that same sound appears again throughout the poem, it should be labeled A. In the poem above, the final sound of cellphone is repeated in the words alone and known.
The second final sound to appear must be attributed the letter B. In this case, it is the final sound of the word hand, which is repeated in understand, grand, and command. The rhyme scheme is, thus, ABBA in both stanzas.
Since you did not specify how many stanzas the poem should have, I wrote only those two. Feel free to add more lines using the same final sounds as before.